The homosexual mentioned by akenaton who 'spends every weekend in a major city' for the 'night-life' is surely joined by literally millions of heterosexual youngsters also (understandably, given their vigour and desire for excitement) out for the 'night-life'. Promiscuity (from what ones sees on those myriad Police in action programmes on TV) and drunken irresponsibility are not the sole preserve of the gay. From watching another programme about an STD clinic, many, many young people, gay and straight, simply never use a condom and contract all sorts of unpleasant diseases as a result.
We know quite a few gay men. Two couples have been together for years and years, and I'd say are completely faithful to eachother. Generalisations are always dodgy and unjust.