I do not claim to be an expert but I am not sure it's the sex that is the problem. I think the problem is what he smokes after sex. Smoking weed affects the brain and when it wears off, he is in "day 2." A sign of addiction is blaming the problem on something else, in this case, sex rather than what he is smoking. I don't think the draining of semen is the problem at all, it's the withdrawal of THC and nicotine from his brain. Here's a suggestion: ask him to try an experiment - have him smoke a bongrip without having sex before and see if he has a day 2 experience afterwards. if he does, then it's not the sex that's the problem. also, he should try having sex without the bongrip afterwards and see if a day 2 is experienced. Of course, these day 2 experiences could all be in his head and that is another situation entirely. i hope this helps. all the best to you!