And I'm sure that there are ladies up waiting for your call. But personally, I hate being an afterthought. You contact me at 10pm with my tomorrow scheduled in advance (and probably with a gent who has given me enough notice so I can be at my best for him), I will not miss sleep to accommodate you.

My primary reason is chemistry. It makes these encounters less nerve wrecking. I would suggest sending a letter of interest introducing yourself with all your screening information to the ladies you like in the area, and letting them know at least there is a possibility of meeting during a sporadic window of opportunity. That way, she can let you know what her short notice availability is, and you can coordinate schedules.  

There you have it. You're screened, and you have a list of ladies who can accommodate you when you need an itch scratched.  

All the best to you!

....last minute (within reason...I expect far more notice than it takes to get a pizza delivered) can be done every now and then .... depends on how well they can be screened and how quickly.
10pm isn't that late (for me anyways).

I'm sure that's not the case but the couple times I've went in blind or on the fly not as good as when I took time to select well. Also gives ya a chance to communicate with a gal before hand to see if you're compatable. Nothing worse IMO than awkward sex. I hate that we just met let's fuck mentality. I like to exchange a few emails before hand. Helps ya dodge a personality ya might not click with, happened to me the other day. Now if ya have an ATF that's diffrent sometimes it's cool to send a booty call text and get a quick "hell yeah let's do this" response. But that's a diffrent game all together since you've already built a good hobby relationship.