A good few years ago now but, London St Sauna in Edinburgh used to be a regular (monthly) haunt of mine.
On one occasion, a WG I hadn't seen before (name now forgotten) asked me, in the room, if I enjoyed anal - I'm not sure why, but I told her I hadn't tried it before - She said she loved it, preferred it to normal pentration and asked if I wanted to try it (no extra charge) so who was I to refuse a lady

Never happened before or since