I have an acquaintance who as a very young man, prior to being converted to Christ, was briefly but heavily involved in (by today’s standards, rather tame) pornography. He is convinced that this put him on a hair trigger, so to speak: His marriage has been severely strained by his difficulties with premature ejaculation. I suppose that can be considered a form of impotence.

Moral: Your mileage may vary, but porn indulgence seems like a bad risk even in purely temporal terms. The spiritual damage is of even greater concern.