DATY is one of the things I look forward to - whether with a provider or a civilian encounter. Part of the reason is that I really enjoy doing it, especially if the woman is able to orgasm (more than once is definitely appreciated).
The other reason is far less boastful - if I can make a woman come a couple of times before the main event, hopefully there's less pressure on me to perform if my stamina isn't up to par.
I really do love doing it though.