dxj - you are right. The women in porn are being paid a huge amount of money (in the decent ones) to do it - if you catch their expressions when the camera is meant to be focussing on something else you'll see them either grimacing which = pain and unpleasant, or a completely indifferent look on their faces, as if they are planning what to have for tea when they finish shooting - neither of which suggests she is actually gaining any pleasure from the act. To me anal in the porn industry capitalises on the fact that many men get off on quite brutal and violent sex - porn anal is usually with huge men who go at it like they are trying to knock down a partition wall - in real life a complete nightmare. Either that or the more considerate and professional porn directors just use good camera angles - look closely and you'll see that in fact most of the guy's penis is in fact not penetrating the woman - because of the awkward angle needed to shoot the penetration shots the man is unable to go the full length so to speak or the penetration would be completely obscured. In the more violent films some anal scenes I've watched are almost verging on rape - in some the girls are visibly off their faces on drugs - so who knows if they were really willing participants.
My advice to blokes that are bottom curious - if your girlfriend wants to try and suggests it then go ahead, have a go - with loads of lube, preparation and go very very slow, if she doesn't like it or it hurts - don't push her and if it's something you really have to have then I suggest trying a bottom bi or gay guy who will enjoy the experience. You also could try taking something up your own butt to get more of an idea how it feels - however bear in mind that you have a prostate, which will likely give you sexual pleasure when stimulated anally, so you'll have to subtract that when trying to imagine how your girlfriend feels.
I have had 5 experiences of anal sex, the first I had no choice and in the middle of vaginal sex I was pushed onto my front and had the guy anally rape me. The second was an Italian who just hurt. The third was German who was extremely gentle and literally took 30 minutes to get in, he spooned me and just pushed a little at a time - that didn't hurt, but neither did I get any sexual pleasure out of it - I'd have rather had an ice cream - however I respect his technique and his respect for me. The fourth was with an Australian who liked to do it because of the pain and humiliation involved apparently - he also told me he liked to strangle his partners, smack them round the face etc etc - needless to say that fling didn't last long!The fifth and final time was with an Australian guy who had a biggish cock - that just hurt. Therefore the sum of my experiences was that anal sex either - hurts or does absolutely nothing for me - apart from rendering me unable to take a shit for the next three days, that when done violently it can also be accompanied by other violent tendancies which should never really be linked to sex in my opinion.
Basically if you would have something done to your daughter, sister or mother - don't do it to other women! Considerate male lovers are a rare commodity these days!