I feel like a whore for acting like this... is it normal? What do you think guys?

I was a virgin till the age of 32. I had sex for the first time three months ago, with a guy. I think I'm bi, but I've never had sex with a woman.

The guy I slept with ("slept" = fooled around more than usual) was a coworker. I don't go to bars or go out often, so it's hard to meet guys.

After I changed jobs last month, I kept seeing my ex-coworker, and we started doing more stuff together. The thing is, I have an extremely open mind, so when he suggested he had a friend who would fool around with us, I had no probem with that.

He showed me a picture, he was hot, so we met. We hanged out a couple of times and we finally broke the ice and admitted we were into each other.

We met at my "BF" house, and we fooled around, going straight into a threesome. However, I seemd to be the most excited of the three of us, and it showed. Not that they weren't into it, but I acted like a super-horny passive guy. I sucked them, I ride them, I did tons to both of them to make them cum, and then some more.

When I finally cum myself, these two were exhausted. It was so hot and felt so good that we did it every weekend since then.

Here's the thing though: I really, really like being these two favourite play thing. It turns me on like I've never felt in my life. But when I look at this rationally, I realize I could be considered their "whore".

They don't treat me bad, and the three of us enjoy this a lot. But every firday night is about meeting and me sucking them and riding them, and while the feeling is AMAZING, my rational mind makes me doubt.

Guys... is this normal? Is this because I've been a virgin for so long? Should I stop caring and just go with the flow?