Having sex can't be as bad as smashing your thumb with a hammer, so refusing to do it at all, when you're capable of it, is something I just can't understand.
I don't want to misunderstand you, so I have to assume you're not including women who are struggling with the aftermath of abuse or rape, or who have difficulty with vaginismus or a host of other problems? What exactly do you mean by "capable of"? If it means the ability to be aroused for comfortable sex, etc., you're almost excluding it only to women who are more or less in a good relationship with you in the first place, making it a tautology.
