Until recently I took anti-depressants and they had the side effect of delaying ejaculation. Sometimes it was good because I could fuck for ages, but sometimes frustrating because I couldn't cum. Now I don't take them any more it seems I'm not used to it and I cum too quickly. It is causing problems because my bf likes getting fucked hard, but I cum too quickly if I do that. It's not much fun for me either. Is there anything I can do to prevent it?