Is it possible to get turned on by seeing my wife fucking other men

There are loads of cuckold videos on every porn site, so you're definitely not the only guy who gets off on this. As for whether or not you're nuts for liking it, that's a matter of opinion.

When you look at your penis, you're seeing evidence that for most of the history of our species monogamy was not the norm.

First, the human penis is proportionally much longer than that of other primates (a gorilla penis is only about two inches long). This means the human penis is capable of reaching deep into the vagina, whereas other male primates are only able to deposit their sperm much closer to the entrance. Also, we're the only species of mammal that has a bulbous glans with an under-curved coronal ridge, and it's been shown by experiments that this shape is much better at removing semen from a vagina than a smooth shaft. The implication is that having a long penis shaft with a flared glans that was good at removing any semen already in the vagina along with being able to forcefully ejaculate semen directly on the cervix were all positive evolutionary traits. In other words, our male evolutionary ancestors were the ones who were best able to remove semen that other men had left in the females they mated with and then deposit their semen where it most counted.

Experiments have also found that men who have sex with women who they know or suspect to have recently had sex with another man produce more ejaculate, ejaculate more forcefully and have a higher concentration of sperm in their semen.

We all like to believe that we're civilised and at least a few steps above mere animals, but the parts of our brain that respond to sexual stimuli are the most primitive bits that we've inherited from our evolutionary ancestors. As any guy who's ever either had an erection at exactly the wrong moment or lost his hard when he _really_ didn't want that to happen will know, those parts of our brain are not under our conscious control. Many people have no idea why they find particular things very arousing and the conflict between our innate, inexplicable urges and what the culture we live in tells us is right and wrong has been a source of endless pain and trauma throughout human history.

It seems to me that it doesn't matter a damn what others think of how you and your wife choose to live your lives. As long as what you do is consensual, everyone directly involved is happy and you're not having a real, negative impact on the lives of those who don't want you to bother them, you should be free to do whatever you want.

As for why you feel different when you're with your wife when she's having sex with another guy but you feel jealous when this happens when you're not around, this is something only you can figure out. Maybe there are trust issues bubbling away deep down? From all I've read about the cuckold lifestyle, it seems that the most important factor in keeping such relationships positive is establishing rules and boundaries, and both people keeping to them. If either of you is sneaking around and doing things behind the other's back, then I'd suggest it's time for some serious discussion about what you both want and need from the relationship and each other.