even if you expected it from people like me, I might actually suggest that, but for different reasons that you think.
When you are having sex with someone, you are as close to them as it gets, and through being close to people, you make those people feel comfortable with you (ie. she'll find it easier to talk to you, confide in you, and trust you). If she eventually wants a relationship with you, then she has feelings for you, and maybe it would be best to take waht you can get and just wait it out.
Being close to someone you love is better than being nowhere near them, obviously.

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Life isn't a bitch...
she's just sick of being personified -Sage Francis