Interesting - I like all sorts. I'm actually just back from a late night Soho wander but in the end couldn't decide on a girl and came home with a full sack. I like the thrill of being out late, especially after about 1 am, though of course the action is limited then. I have one regular who I call every couple of months or so, usually at about midnight, when the OH is away or not expecting me home, and there is a special thrill about setting off for an arranged punt when everyone else is going home - sort of feels like stolen time.
On the other hand there's another regular who I usually meet in the mornings - 9.30/10am - and that feels equally exciting and dirty, especially when I see everyone else on their way to work knowing that I'm about to be nuts-deep in a raunchy black BBW who makes me a cup of tea with her top off before we start.
Similarly I'm often within reach of Soho of an afternoon, and a half hour absence from work is easily accounted for. Colleagues are having tea and a biscuit while I'm climbing the stairs in Greek Street for another go with Roxy - fabulous.
I guess I'm easy to please at any time of day...