Can Women’s Sweat Treat Low Testosterone in Men?

Thomas David Kehoe

Casa Futura Technologies

This project ended on:
9 August 2014
Can low testosterone be treated without medications or side effects? We’ll give young women scrunchies (hair ties) to wear for a week, then send the scrunchies to low-testosterone men. Studies have found short-term effects in testosterone levels in normal males; this will be the first investigation of long-term effects with low-testosterone men. Anecdotal reports suggest this could double testosterone levels.


Budget Overview

The male subjects will pay for their own testosterone tests. Saliva tests cost about $60.

We'll recruit female subjects via Facebook ads (18-30 years old, not pregnant, not on oral contraceptives). They'll be paid $25 each. The women will wear scrunchies in their hair during the week before ovulation (tracked via free fertility apps). The women will mail their scrunchies to us in ziplock bags.

We'll vacuum seal the ziplock bags and mail these to the male subjects.

The men will dampen the scrunchies then wipe them on their upper lips.

Half of the men will receive new scrunchies (controls). The men will be divided into three groups receiving 15, 8, or 4 scrunchies per month.

We need a minimum of 24 men and about 120 women. To save money we'll cut scrunchies in half, or have women wear two scrunchies, or have women wear gauze pads under their arms.

For each female $10 advertising, $25 payment, $10 for the scrunchie and postage; subtotal $45. With 120 women the total is $5400 for one scrunchie per woman per month. Our minimum budget is $1350, in which each woman sends us four items (two scrunchies and two gauze pads, two scrunchies cut in half, etc.).

We'll recruit the male subjects from the men who donate to this project who are not on hormone replacement therapy, are at least 18 years old, and are in the United States.

For 24 men we need 216 mailings. We're budgeting $10 per mailing for packaging, postage, mailing labels, etc. We could save money by mailing First Class or by including several scrunchies in one package. This totals $2160 for the male subjects. Our minimum budget is $5 per mailing, with 2 items per mailing, or $540 total.

We should be able to accept male subjects for a $100 donation. If we exceed our funding goals via larger donations ($350 or more) we'll use more scrunchies and fewer gauze pads, etc. If we exceed our funding goals via many small donations ($100 or less) we'll add more subjects but stay with the "low-budget" plan.

Meet the Researcher


When I was 37 my testosterone was 378 (the normal range is 270-1070). Then I took a summer dance class at a university, three times a week for eight weeks with a dozen sweaty young women. My testosterone rose to 871, or more than doubled.

I have more than twenty years experience in medical technology. In 1992 I founded Casa Futura Technologies, the leading manufacturer of devices for treating stuttering and the speech disorders associated with Parkinson's. My expertise includes evidence-based medicine and we have about 20 published studies.

After grad school no one hired me because I stuttered severely. I went to the university library and read every book and journal about stuttering. I read about laboratory experiments in which electronic devices made stutterers talk fluently. I built one, it worked, and I started a company.

I can "think outside the box" to solve a medical problem in ways others can't or won't consider.

Literature Review

Ellison (2002) compared testosterone levels in men ages 15 to 60 in four populations: Lese farmers in the Congo, Tamang farmer-herders in Nepal, and Ache hunter-gatherers in Paraguay, and Americans in the Boston area. The researchers found that American men had the highest testosterone when young (average 335 in the 15- to 29-year-old age group) and a 29% decline to 238 in the 45- to 60-year-old age group. Congolese young men were 286 and declined 14% to 247. Nepalese young men were 251 and declined 10% to 225. Ache young men were 197 and declined 2% to 192. In the 45-60 age group all four groups had similar testosterone levels. American young men had 70% more testosterone than Ache young men. It appears that American young men have unusually high testosterone levels, which decline to normal levels with age. This may be because American high schools and colleges put hundreds, even thousands, of young men and women in close contact. In contrast, a hunter-gatherer may only occasionally meet an unrelated person of the opposite sex.

Additional studies have investigated testosterone and aging in Japan, Turkana men of Kenya, Ariaal men of Kenya, and Zimbabwe.

Kuukasjärvi (2003) had 42 women using oral contraceptives and 39 women not using oral contraceptives wear t-shirts for one day. The researchers noted where each woman was in her menstrual cycle. 31 men and 12 women then smelled the t-shirts and rated the sexual attractiveness. The men rated the sexual attractiveness of the t-shirts worn by women not using oral contraceptives as highest around ovulation. No correlation between sexual attractiveness to men and ovulation was found in the women on oral contraceptives. No correlation was found in the women's ratings for any of the women's t-shirts. This study suggests that oral contraceptives may contribute to men's low testosterone because women on oral contraceptives don't produce the pheromones signaling ovulation that boost men's testosterone.

Many non-human animal studies have found increases in testosterone in males after exposure to females' bodily secretions such as urine or vaginal fluid. Most of these studies have been with rodents such as mice, rats, and hamsters. A few studies have used monkeys. (See the bibliography in Roney and Simmons (2012) for these references.)

Miller and Maner (2010) reported two studies in which young men were exposed to women's sweat. In the first study, four young women (18- and 19-year-old college students) wore t-shirts during ovulation, and then a second t-shirt during their luteal phase (far from ovulation). The women were not on hormonal contraceptives; showered with unscented soaps; refrained from using perfumes, deodorants, and antiperspirants; avoided odor-producing foods (e.g., chili, garlic, pepper, vinegar, asparagus); and didn't use drugs. The women wore the t-shirts while sleeping for three nights, then put the t-shirts into freezer bags and gave them to the experimenters, who then froze the t-shirts. Within six days the t-shirts were defrosted for the experiment. 37 young men (18- to 23-year-old college students) smelled one t-shirt each. Testosterone was measured via saliva before the experiment and fifteen minutes after smelling a t-shirt. The results showed a very small (0.5%) increase in testosterone after smelling the t-shirts worn during ovulation; and a more substantial (18%) decrease in testosterone after smelling the luteal phase t-shirts.

In Miller and Maner's second study, eleven young women (18- and 21-year-old college students) wore t-shirts during ovulation, and then a second t-shirt during their luteal phase. A third set of t-shirts was not worn by anyone. 68 young men (18- to 23-year-old college students) smelled one of the three t-shirts. In this study, testosterone dropped for all three groups. The ovulation group dropped 7%; the luteal phase group dropped 20%; and the control group dropped 17%. This study also asked the men to rate odor; the results were that men preferred the odor of the t-shirts worn around ovulation.

Roney and Simmons (2012) had young women (mean age 19) wear gauze pads taped under their arms for five minutes after they had "broken into a sweat" while walking around the University of Texas, Austin psychology building on a hot day. The gauze pads were then frozen and sent to the University of California, Santa Barbara. The researchers then placed the gauze pads into bottles of water. Additional new gauze pads were placed in other bottles of water. Young men (mean age 20) participated twice, about a week apart, in which they smelled the bottles. Saliva was collected twice before and four times afterwards (15, 30, 45, and 60 minutes afterwards). No change in testosterone was found.

These results suggest that women's sweat isn't an effective way to boost men's testosterone. However, our study will differ from the above studies in several ways:


Ellison, P., Bribiescas, R., Bentley, G., Campbell, B., Lipson, S., Panter-Brick, C., Hill, K. (2002) Population variation in age-related decline in male salivary testosterone. Human Reproduction, 17:12, 3251-3253. Free download:

Attractiveness of women's body odors over the menstrual cycle: the role of oral contraceptives and receiver sex
Kuukasjärvi, S. , Eriksson, P., Koskela, E., Mappes, T. , Nissinen, K., & Rantala, M. (2004) Attractiveness of women's body odors over the menstrual cycle: the role of oral contraceptives and receiver sex. Behavioral Ecology, 15:4, 579-584. Free download:

Roney, J., & Simmons, Z. (2012) Men Smelling Women: Null Effects of Exposure to Ovulatory Sweat on Men's Testosterone. Evolutionary Psychology, Vol. 10 Issue 4, p703-713. Free download:

Miller, S. & Maner, J. (2010) Scent of a Woman: Men’s Testosterone Responses to Olfactory Ovulation Cues. Psychological Science February 2010 vol. 21 no. 2 276-283 doi: 10.1177/0956797609357733 (Download costs $35)

Project Backers

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