Ok, let me clarify. If a guy has a problem keeping it, even occasionally, and does not try to do something about it either medically or mentally then he should expect to have problems with women wanting to play with him. After all this IS about the act of sex. I think I misunderstood the OP.
The thing is, from what I have read here a few times, many women do have predudices against men who do need help (Viagra, Cialis) keeping it up for whatever reason. As long as it works when needed, what's the difference?
I do need help occasionally because of meds I have to take on occasion but it still works everytime.
It has no reflection about the woman I may be with though and they shouldn't take it that way.