It's really up to the woman concerned as others have said; the big issue is the lube situation. Vaginal sex creates a natural lube scenario and doesn’t usually cause discomfort. Anal on the other hand has to be handled with tenderness and care and unfortunately a lot of men seem to normally consider it in the same terms as vaginal (ie) wham bam, thank you mam.
It is when done correctly awesome, and a fantastic experience, but it as I said takes time, so maybe that's why a lot of girls opt out. Half hour appointments I don't think would be sufficient to allow for this.
rubberlover
it's all about lube and time - as rubberlover said it's not a wham bham situation - you need to ease your lad in very very slowly, she needs to be well relaxed and REALLY in the mood, but man once you've got your rod eased deep in and given her boobs and clit plenty of attention it is VERY worth it - she'll get a great feeling and so will you IF you've taken the time.....
for me i cud never get enuf ha ha!!! i particularly love it doggy style
Irish-hazelx
Always up for fun and games in your bed!!