boyfriend, OCD, Prozac, etc.

My boyfriend has been taking Prozac for about a couple months maybe. I wouldn't say it has decreased his sex drive significantly, but it does affect his ability to orgasm. We had sex three times this weekend and he only finished once. He takes Prozac for OCD.
He doesn't know that I know, but a big part of his OCD is "gay OCD." Which I've talked to doctors about and they said that people with OCD who are paranoid with thoughts about being gay are not. They usually have these thoughts because they are worried and don't want to give up being with people of the opposite sex.

I do not think my boyfriend is gay. He still tells me how much he wants me and wants to have sex with me. He can't keep his hands off me when we're together.
But if he is, I will support him completely. I love him.
I visited him this weekend and we had an amazing time together.

I really want to talk to him about his medication. I don't want to seem pushy. All I've asked him so far are vague questions "Are you ok?" or "Is everything ok?" He always says yes. I know the medication helps him and his manic and racing thoughts have stopped.
I just don't know what to say.
I want to bring up how I'm scared the medicine is going to affect our sex life more. I feel like the reason he can't finish anymore is because of me. Even though he says it's the medicine.
I cry and I worry about this. I want to stop. I just want to hear from him that he doesn't think he's gay because of me. But he doesn't know that I know he's had these thoughts.
I love him so much. He tells me he wants to marry me and we talk about kids and our life together.
It's eating away at me inside and I hate holding these thoughts in.
I'm also more paranoid because one of my ex's just came out of the closet.
I'm going to a counselor as soon as I can and talk to them. I can't talk about this with anyone.
If anyone has any words of advice or encouragement, it would be greatly appreciated.

fyi - I accidentally came across something and that is how I found out what his OCD was mainly about and his racing thoughts. He's told me about his depression and OCD and medication.

I really want to talk to him about his medication. I don't want to seem pushy. All I've asked him so far are vague questions "Are you ok?" or "Is everything ok?" He always says yes. I know the medication helps him and his manic and racing thoughts have stopped.

These are actually good questions to start off a conversation of this nature with, but you have to progress to more specific and 'risky' questions as the conversation continues. For example, you could start off by asking him if everything is okay, and then letting the conversation linger on a bit. After a while, ask him if he thinks that the Prozac helps him and, again, allow the conversatio to linger on. Finally, ask him if he thinks htat Prozac is affecting his sex drive, or if he has felt any decrease in his libido. If you went straight to the final question without asking the other two, then he'd be sure to be confused, hurt, and angry with you.

What do you think?

Kevin