I'm not a girl, but I think I can answer this one.
It's unrealistic.
I don't know if you've ever played hentai dating sims? If you have, you'll probably agree with me that there's little exciting about those games, but a lot humor if you watch the story line (not intentional humor though).
Porn is somewhere between realism & those hentai games & probably closer to those hentai games than to realism.
A girl is in a house, babysitting, while it's still light outside (this probably means that it's not evening yet). Still, there's no kid in sight. She's wearing a miniskirt & no panties (what parent would want a girl like that babysit his or her kid?). Daddy walks in (usually either an ugly guy old enough to be a kid's grandpa or he became a father when he was 17!), notices she's not wearing any underwear and instead of kicking her out of his house (why would he need a babysitter when he's at home anyway?) he fucks her.... Very realistic...
A total stranger steps into your car, is groped (if you or I did that to a hitchhiker we'd be slapped and we'd probably receive a fist in our private areas as well...) and driven to a place she initially didn't want or needed to go to (does she protest though? No) and is fucked and sometimes humiliated at that place (she doesn't seem to mind though).
Then the sex itself. The girl gives the guy a blowjob & nearly cums while doing that (as far as I know the mouth still isn't capable of receiving such amounts of pleasure). Then the guy penetrates her and after 5 minutes she's had 10 orgasms (I'm exaggerating a bit), even though about 75 percent of all women never reach orgasm from sex without the extra help of sex toys, hands or tongue. And 10 to 15 percent never cum under any circumstances.
source http://abcnews.go.com/Health/Reprod...orgasm-eludes-majority-women/story?id=8485289
Add to that the girls clothing, combined with the surprise when she finds out that the guy actually wants to fuck her, even though she's dressed in such a way that there's little doubt that she wants anything else than to be fucked, generally makes porn a bit unrealistec.
Men don't care about that (it's usually male fantasies being shown in porn flicks). We care about a hot body and a pleased girl. End of discussion, for the guy anyway. We hardly notice these flaws in porn (except for some, like me. It's one of the reasons why I generally prefer photo sets (unless the girl is
really hot)).
Women have different needs, different ideas of what's hot, erotic, etc., so they
do notice (I think).
If this is wrong, I'd like the women on this board to correct me.