Mr Veritas, I find it really odd that you should know about the dating rituals and sex life of your grandson ! I'm a gay guy, but irrespective of sexuality, the last thing I'd want anyone to know is when I'm off on the prowl to get my end away. May be I'm niave, but I thought clubbing was about getting wasted with your mates... or I'm completely off track lol.
I really disagree that stereotypes dont exists. A stereotype is based on popular generalisations and geralisations occur when sometimes is generally true. In my nearest city, a stereotypical Asian male is either a taxi driver or a newsagent, has many children and plays cricket in one of big parks just outside the city. That stereotype exists because, generally, that describes the most visible group of Asian men in that particularly city, albeit they will be a tiny minority of the Asian community. In fact, stereotyping has a political correct off-shoot called 'demographics', which is basically a study of people and stereotypes. Its not therefore wrong to stereotype, as long as we understand people are individuals, irrespective of what stereotype or demographic they fall into.
As for gay sex, dogging is to straight people what cruising and cottaging is to gay people, so we aren't that different. However, I think you're confusing the gym with saunas and bath houses... I've never seen any of thing go off at my David Lloyd. I have known people use saunas etc, even young guys, but the idea repulses me. Casual sex with friends or people you know of and like doesn't bother me, thats how single people maintain a sex life, but sex with a stranger you feel nothing for seems pointless and even seedy. I do think, from experience, stereotypical gay guys are every bit as promiscuous as most stereotypical, middle aged middle class straight people think they are.