Men: Seven reasons you're not having sex

There are many reasons that men don't have sex, the most usual being that they don't have anyone to have sex with. Illness, impotence and abstinence are also perfectly compelling reasons for men not having sex.

But healthy men in relationships should be having sex, surely? They should be having sex regularly, and at the outset of the relationship they should be having sex pretty much all the time, with short breaks for work, sleep, sustenance and so on.

In fact, it's often not as simple as that. When relationships mature beyond the 'like bunnies' stage, it's not unusual for men, in particular, to wonder where the sex went. Relationship therapists say that one recurring problem is a growing mismatch between the sex men think they should be getting, and the sex they actually are.

Sometimes, sex problems within couples are deep and ingrained. And sometimes a few minor changes can help to close the gap between the sex you'd like and the sex you get.

So here are seven reasons you're not having sex, and what you can about them.