Researchers from Turku came to this conclusion after interviewing more than three thousand men-all pairs of male twins and their older or younger brothers-about the first time they had sex.
Most of the persons surveyed revealed that they had suffered from erectile dysfunction and premature ejaculation at their first sexual encounter.
The research confirms the belief that these common problems are often related to external factors like intoxication or nervousness due to peer pressure.
However, according to the researchers, premature ejaculation also appears to be strongly linked to genetic factors, and is not just psychological.
The study has been published in the Journal of Sex & Marital Therapy.
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