And note that, whether Epicurus was sexually active or not, he certainly didn't demand celibacy from his students. A number of them, we know, had children!
Remember, too, that, according to some sources, Epicurus's health wasn't all that good. So, it's possibly the case that he wasn't physically up to the task of having sex. However, wasn't one of Timocrates' slanders that there were orgies ever night in the Garden... probably only because there were women attending the classes and lectures and.. by Zeus!... writing philosophical treatises!! Oh my! Likely, due to the limitations on the movements of women in ancient Greek society, those women were most likely wives accompanied by their husbands or they were hetairai. Elodie Harper's novel The Wolf Den gives a vivid picture of the difference between the hetairai and the pornai in ancient Pompeii.