I've been having an ongoing sexual relationship with a married neighbor for a couple of years now. It's nothing serious, just an occaisional fuck session when it's mutually convenient, like less than a dozen times a year. While we were always pretty friendly, she initiated the sexual element to it, and pretty much has been with her initiating each sexual encounter. Her husband is a nice guy, but not somebody who I'd call a "friend." I feel a little guilty about doing his wife on occaision, but as she's always the one who initiates the sex with me, I figure that if she's not screwing other guys as well, she'd be doing so if I wasn't around. The fact that she's a really amazing sex partner doesn't help me to say "no" to her offers either. I don't want anything more serious with her, and she feels the same way about me. Have any of you been in a similar situation, and if so, how did you handle things?