So I know this sounds kind of insane, but bear with me...

I have two female cats, Tonks (who is spayed) and Molly (who has an appointment to be spayed in about a month). A few weeks ago, a male stray "adopted" use and has decided that he wants to live in our house. He's been staying on the patio, but he keeps trying to come into the house. I just assumed he wasn't neutered, and I've been working on the transition of moving him into the house with the girls.

I don't want kittens, so I am very careful when I bring him inside. However, he wants nothing to do with Molly, even when she was going through her first heat recently. He is not aggressive at all, but he avoids Molly as much as possible. He has no problem with Tonks; in fact, he's very submissive to Tonks, who is the boss of our household. He hasn't shown the first sign of aggression, he doesn't even show his claws when he's playing, and hasn't so much as bared his teeth at any of us. I've had no problem with him spraying, and he is content to just lie in my lap for hours being petted.

So that long explanation leads to this question: Is it possible that he has been neutered, but still shows the appearance of testicles? He has short hair, and his scrotum is clearly visible. I'd like to be able to move him into the house as soon as possible.

Any help would be appreciated! :)