I can see an interest in recovering that initial ‘lust in the loins’ (as Diane Ford put it). But I think you have to be careful, too.

If you just increase your partner’s *general* interest in sex - you risk spreading that interest outside the relationship. Increasing your partner’s interest in sharing pleasures with you should be grand, though, right?

The fact that sex often tapers off as a relationship goes on is a part joke, it is so often true. Sex is a result of revving your hormone engine, and like any chemically induced mood change, it takes more and more to get that same ‘high’ feeling. That, or longer periods between celebrations, to keep things fresh and rewarding.

I think you can have sex, or you can have a relationship that includes sex. If you start with a relationship as your goal and your partner’s goal, then the sex should bring more satisfaction (and babies). If you start out with sex as the goal, then even if you change your mind and want to go permanent - your partner met their goal, why expect them to now pursue your goal? Surprising your partner doesn’t work well for life planning.