Looking for casual only, maybe regular

Late fifties, ok looking, reasonably fit, nice guy. Looking for a bit of fun, but not a relationship. When I say "casual", I don't mean completely anonymous or beats - let's keep it civilised folks. Mainly looking for some possibly regular fun - if we practise, maybe we'll get good at it!

Ideal partner

Basically men who are stable, grounded, and good company as well as good in the sack. Smiling is good. Preference for people who are not terribly skinny, but also not really obese either: I like a wide range of average. Preference given to non-smokers. Bi/married more than welcome.