If you and your partner are going to be sexual for a long time, then think of it as dinner. You need to vary the recipes for sex on occasion. That could mean having sex in different ways, in different rooms, etc., or even getting away and having an affair with each other in a hotel. It is what sex therapists hear about very often. It is very simple to fix and can be treated 95 percent of the time.
Some people can put numbing creams on or wear double condoms.
There is a very simple training technique that we put the man through so he can control the timing of his orgasm. In much of traditional sex therapy, part of the exercises need to be done with a partner. This is different from seeing a prostitute because a prostitute wants the man to have an orgasm very quickly. A sex surrogate might take weeks to become overtly sexual, so it would be a very expensive way of having an orgasm. The sex surrogate has training to help the guy figure out why he is having a problem.