Greg's sexual fantasies

Greg, 43, is a car salesman and has been married for 15 years. 

I love my wife and we're rock-solid, but sometimes I do get erotic thoughts about other women - especially about swinging. I get really turned on by the thought of group sex.

I'm not frustrated or anything and I don't know why I get these fantasies, but maybe after 15 years together you just want a change, something a bit different. I'd love to share my fantasies with my wife and I think it'd be good for our sex life.

I don't dare broach the subject because she's too jealous and she'd take it the wrong way - as if I wasn't happy with her in bed. She'd feel guilty. So for the moment I keep my fantasies to myself, but fantasising doesn't do any harm...