How much sex will make me happy?

If you are in a couple, it will make you happiest if you have it once a week. But having it more often won’t increase your happiness

Chemsex: how dangerous is it?

People have been mixing sex and stimulants since Roman times and before. But the growing phenomenon of chemsex – the taking of a cocktail of drugs and having sex for up three days with multiple partners – is leading to a huge rise in sexually transmitted diseases