My introduction was when I was about 17 and hitchhiking, and a businessman picked me up. The conversation turned to girlfriends and sex and he asked if I wanted to see pics of his wife nude. I said sure, and he pulled over to a secluded spot. After I stared looking he asked if she was hot and it aroused me. I said yes, though I wasn’t that turned on yet, and he asked if I wanted to masturbate. I said, sure. It happened very fast, suddenly I had my pants down and was jerking off while this guy watched. The rest of the drive was super friendly and he took me home, out of his way. I’ve jerked off to the memory many times.I find it very erotic, in a couple of ways. Of course, it’s always great to masturbate to amateur women, but I always feel that this is a woman who is ‘owned’ by a superior man, and I’m just a masturbator. I’m admitting to being a masturbator. That’s very erotic. For me it’s an ultimate in masturbation…we don’t have sex, this is how we have sex with attractive women. We worship them. Tribute is a good word, it is our ultimate praise for their sexual power over us. …and acknowledgement of their man as sexually superior, and knowing that they both are sexually aroused by my masturbating is very exciting to me. I love masturbating with other masturbators who share love of masturbation, but ‘performing’ for a couple who have sex is another thrill entirely.
Source: (110) Candaulism – showing wife pics to other men so they can masturbate – Onania Masturbator Forum