I can't have sex...

The guy I lost my virginity to an I aren't together anymore but we still spend time together and have sex. I know he has been having sex with other females but I can't get myself to have sex with someone else. I don't want a large body count so I just have sex with him when I'm feeling (3-5 days a week). Well right now I'm out of town and I'm ridiculously horny. What do you girls do for a nice quick full orgasm when your man is away?