Pussy full of cum is what turns some people on - they like to see a nice, shaved cunt getting creampied, with the jizz slowly dripping out of it. For those people, the cum in the cunt might even be better than the act of sex itself, and they are just having sex to get to that beautiful sight of a cum dripping pussy. Men have no problem with cumming in the pussy - it is easier than pulling the cock out.
