How to ask your friends with benefits to come over without sounding like an ass how?

Freshman year of college, this girl and I agreed to to be friends with benefits (friends with benefits) and she was the first the one who wanted to have sex. We hooked up twice in my dorm room, I never once asked or pressured her to come over, she came over wanting to have sex... And she doesn't sleep around or anything like that, the only guys she had sex with was her ex.. They broke up cause she went to college, it was two month after their break up that we had sex.. My question is now that school is starting again, how do I ask her to come to over to my apt, without making her feel like a she's a slut or anything? ... This society is so messed up, it's like only girls get judged when they wanna have sex..
How to ask your friends with benefits to come over without sounding like an ass how?
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