I am 23 years old and fit and muscular. I am straight and have a beautiful girlfriend. I work out nearly everyday and I’ve recently started going later in the evening due to my work schedule. The other day I decided to go in the sauna and it was busier than normal and there was only one spot open so I sat between two older guys. I noticed everyone had their towels off and they were all just sitting there totally nude. I usually just keep my towel wrapped around me when I go in there. So I’m sitting there with my eyes closed and I hear some slight moaning. I open my eyes and two guys across from me are massaging each other’s cocks. The guys next to me are stroking as they watch. For some reason I could feel my cock start to stiffen under my towel. I’ve never been turned on by a naked guy but something was turning me on. I went to get up and out of there when the older man next me grabbed my cock over my towel. I got very hard as he rubbed it. I was frozen. I finally just got up and went to the showers as fast as I could covering my erection. I couldn’t understand why this made me so hard. I jerked off with the image of those old men jerking each other. Dressed and went home. Now I can’t wait to get back there again. What should I do? This makes me so horny.