People often make comments about how wierd it is for a guy to watch his woman getting fucked by another man. Those comments are likely coming from people who aren't as secure (or as perverted) as I am. My girl loves me and we have awesome sex together on our own. When you're having sex with your partner the things you see are very limited. When you're watching them you can see the primal things about them. Watching and listening as a huge cock first enters her pussy is absolutely awesome. Hearing her moan and grab the bed sheets as she's getting rammed by someone who is experiencing her for the first and possibly only time. He wants to make her really appreciate what he has. So, now you might have a little better understanding of what makes some men want to see their girls taking a strangers cock.
I get to bite and play with that all I want!