Agree Axeman, it is worrying when you think about it. They open the door 8 times a day to a new cock/presence and some how manage what follows, physically and mentally.....or don't.
Aside from the nymphos, I simply don't know how they do it, particularly those who have been at it multiple years and seem okay.
No hypocrisy here ...I acknowledge I am a punter who takes advantage.