For the longest time, I wondered whether I was bi or gay because I got turned on watching cocks squirt cum all over beautiful women in porno, and I didn't get nearly as turned on if I couldn't see a guy cumming. Last weekend was the first time my girlfriend and I invited another guy to join us masturbating, and when Bill popped all over Karen, I came a load twice as big as any I ever had since I was a teenager, practically without even stroking. Now I get it - it's called 'sperm competition' and, for some of us anyway, seeing another guy cumming on 'your' girl makes you cream like crazy for deep biological reasons. I'm still reading up on this, but it definitely was the biggest orgasm I've had in more than a decade...and seeing Karen covered in both of our jizz was pretty hot.
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