Research published this week by Marie Stopes shows that of 4,000 adults not trying for a baby, a third of women and almost half of the men had unprotected sex at least once in the past year. And here's the surprising part. Around eight out of 10 of those having unprotected sex said they believed it was "very unlikely" that it would result in pregnancy or they'd contract a sexually transmitted infection. When it comes to our sex lives, it seems we cross our fingers and hope for the best. Yet 185,000 women accessed abortion services last year, which suggests that for quite a lot of us, it does happen. Half a million STIs were diagnosed last year too, some of them incurable and life-threatening.