A study published by "New Scientist" showed that testosterone levels rised after being aroused for 15 minutes WITHOUT ejaculation. The research consisted of 10 men and 10 women, who were exposed to a pornographic film for 15 minutes. The testosterone levels increased by 100% for men and by 80% for women. These testosterone levels also showed aggression and sexual aggression.
Believe it or not, studies on the effects of ejaculation and testosterone are mostly done with animals. A study was issued on a rat, that ejaculated and it's testosterone levels were twice as high, and after ejaculation 4 times in a row, the testosterone levels still remained high.
Final thought: Does it help? Yes it does. To increase testosterone levels, you have to be sexually aroused with ejaculation for 15 minutes. Results may vary.
