Finding Out I Like It.

I'm totally perplexed by this.
Basically I caught my wife being fucked by a guy, after she accidentally sent me a live video link through our house security cameras.
We have two internal cameras. One looks right through from our front door to the kitchen and rear patio doors.
The other covers our lounge and dining room, but we only have it working when we're out.
However she'd somehow triggered the camera, and sat in my car having lunch, I got to see this guy fucking my wife missionary, then from behind on our couch.
They were both naked and my wife was obviously enjoying this guy fucking her.

The bizarre part, is I couldn't stop watching and becoming ultra turned on.
So much so I took my dick out and masturbated to the sight of my wife orgasming on another mans dick.
They then moved so my wife was bent over our dining table and I was able to see his much larger cock thrusting deep inside my wife's arsehole.
She hardly ever lets me fuck her arse, and it was seeing her being fucked anally which had my spunk flying everywhere.

Once I'd cleaned up as best i could, i phoned my wife. It was strange watching her take the call as her lover was going down on her back in the lounge.
It was then she noticed the camera's were on and the feed ended.
I didn't let her know I'd seen them and spoke about going to see her parents later that day.
Just before i finished the call, i heard my wife go "Uughh" and knew he'd just entered her again.

It's been two months since I caught them fucking and I've now watched them five more times, switching the camera on when I want remotely.
I've also (And my wife doesn't know this) put a small camera in our bedroom.
They tend to fuck downstairs, but they have fucked once on our bed. That was the day I got home earlier than usual and surprised my wife.
It was obvious she'd not long had sex as I could smell it, and I made sure I did what I'd wanted to do since I first caught her. I went down on my wife and could taste his spunk all over her pussy and arsehole.
She tried to say no, but I knew why and eventually she was pulling my face into her pussy. When she orgasmed I thought I heard her say "Oh Chris". Not my name.

The reason I'm perplexed, is at no time in my life have I ever been a beta male. So why do I find it soooo fucking horny watching another guy fuck my wife.
It's even gotten to the point where I'm considering letting her know, I know. So I can maybe watch them up close and personal.
What I do know, is now having tasted his spunk twice, I like the taste of cum.