I prefer week day mornings myself. It's usually the easiest time to get out of the office for some fun. Weekends and evenings are universally out, as I live outside the city.
I prefer mornings as I like to be first of the day. SP fresh and rested and I'm not tired. Older guys sometimes have performance issues later in the day. TBH I think some of those issues are often caused by the SP not being what we hoped or maybe tired herself. I usually see Violet after work and performance is not an issue with her. Guess my point is that I more frequently have issues later in the day when tired, as opposed to mornings. A great SP can usually overcome that.
Not that I can always do mornings, but it is my preference.
I like in the evening. After a good time in hobbying, I go home, rest and fall to sleep after.
Sometime, it helps me sleeping, as I keep dreaming about the beauty that I met.
I tried earlier during the day, but if I'm all in the action of work, my head might not be 100% there.