If a young man's low testosterone is a problem for a couple trying to get pregnant , gonadotropin injections may be an option in some cases. These are hormones that signal the body to produce more testosterone. This may increase the sperm count. Hedges also describes implantable testosterone pellets, a relatively new form of treatment in which several pellets are placed under the skin of the buttocks, where they release testosterone over the course of about three to four months. Injections and nasal gels may be other options for some men.
They don't seem concerned. Emi Kuwahata, 23, and her friend, Eri Asada, 22, meet me in the shopping district of Shibuya. The café they choose is beneath an art gallery near the train station, wedged in an alley between pachinko pinball parlours and adult video shops. Kuwahata, a fashion graduate, is in a casual relationship with a man 13 years her senior. "We meet once a week to go clubbing," she says. "I don't have time for a regular boyfriend. I'm trying to become a fashion designer." Asada, who studied economics, has no interest in love. "I gave up dating three years ago. I don't miss boyfriends or sex. I don't even like holding hands."