Its actually kinda funny really because men peak in their sexuality in their 20s/30s and thats when women have a decreased sex drive but once a woman hits 40s/50s thats when they reach full sex drive and thats when men dont want sex that much anymore. My mom told me one time that my dad used to practically beg her for sex and she wanted none of it and he said just you wait...youll know how i feel when you hit middle age. She said she thought he was nuts lol and sure enough now she tells me shes the one practically begging him for sex. If you think about it long enough though it might be because a woman is more on focus with work and families and bills around their 20s and 30s and men are still ready to just have fun but around 50 is when women have learned at that age to relax and by then things are pretty much stable and its time for them to have fun and for men at age 50...they are settled down so to say.