Just to react generally and off-handedly thus far: there would seem to be a wide gulf between being "overwhelmed by sexual passions" and "selective sexual prudence.
I agree, and it seems to me prudent to remember that every kind of "ethical" advise is a matter of context and still is judged in terms of all pleasure being desirable by nature (even though not all is to be chosen) and "what will happen to me if I pursue this course and what will happen if I do not?" There is a wide gulf between how events unfold in different contexts, and if you are confident that you have arranged circumstance so that a particular pleasure will not bring more pain than it is worth due to your preparations, then I would think Epicurus would say it would be appropriate to engage in it. Rules of thumb are good general guides but there is no god or fate guaranteeing results so the calculation of the risks is yours to do contextually.

