My ultimate fantasy is watching my boyfriend have sex with another man

This week’s diarist fantasises about her boyfriend being unfaithful (Picture: Myles Goode/Getty)

Welcome to How I Do It, the series in which we give you a seven-day sneak peek into the sex life of a stranger.

This week, we hear from Ottilie* a 26-year-old English graduate who lives in Birmingham with her boyfriend of three years, Matt*.

‘We moved in together not long after graduating, and from the outside we probably look painfully normal,’ she tells Metro. ‘But people would never suspect what turns me on.’

While Ottilie is heterosexual, her boyfriend is bisexual, and over the la...