Open Question: Am i taking advantage of my girlfriend?

[feedcrawler]

I have a foot fetish that i have known since forever... but I have never revealed it to anyone, including my girlfriend (and my high school "girlfriend" whatever that means!) She works really hard (we are both in grad school, but she is in bio and spends the whole day on her feet in the lab while i get to sit on a math dept desk) and i rub her feet several times when we are in bed. However this happens specifically when she's not "in the mood" and I am pretending to be a considerate boyfriend who rubs her feet out of love when in truth I am getting a sexual high. Am i taking advantage of her or is this an innocent game in which everyone wins?

More...