Best thing - the whole experience of being in the presence of good looking, skilled and naked, younger than me ladies who work hard to make my time with them something I won't forget - and enjoy it themselves while they make that happen (or at least make me believe they do).
Also love: the variety. When I first started I told myself that if I found three ladies that I particularly liked, I would be perfectly happy with that rotation. I was lying to myself and it did not take me long to see that I really enjoyed the build up and anticipation when meeting someone new.
But that does not diminish in the least the ladies I have really clicked with that I have enjoyed numerous times. There is much to be said for the comfort level that is built from multiple sessions and I find those hobby "relationships" tend to get hotter in every subsequent session..