As this is a Christian board, I'm assuming that you're struggling with this desire. It's not a good place to be to be fantasing about something unhelpful; if you agree that it's sinful, then it's clear violation of Jesus' and Paul's to seek to live in purity of thought. Instead:

"Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things"

Phil 4:8