I used to come almost immediately after intromission, especially when she would moan with pleasure. Then, I began doing some of the tantric exercises (see other thread) and now can last much longer, even softening up a bit and taking a cuddling breather. It's still hard for me to last longer than 7-9 minutes of real fucking, although the spoon position helps me sometimes. That way I can rub her belly and play with her clit and not make the whole thing a race to the sperm bank.