I know for a fact my ex-bro-in-law (divorced from my sister, but we're all still friends) has the hots for my wife. He's always flirting with her, etc. He was drunk last weekend and actually offer her $100 just to kiss her! LOL
He's seen her topless a few times, and I'm sure has taken those mind images with him to masturbate. I don't mind at all, and my wife thinks it's hilarious. She goes along with the flirting, but won't go any further with him. "Not my type" she says.