How much sex can a man handle?

I am about 5 months pregnant, and completely turned on all the time. I would like to have sex 3 times a day, but I am trying to limit myself to only bothering my husband once a day. My husband has been great about fulfilling my desires every evening. He is a wonderful lover and i always have multiple orgasms. I try to be a good lover to him. I think i am good at giving him oral sex. I have a few tricks :) he says the sex is good, but I always feel concerned if I'm tight enough, wet enough, too wet...etc. I also recently suggested that we look at some passionate porn together. We have both never looked at porn before, but now I'm afraid I've opened a can of worms. He told me that he looked at a lonely housewives site. He made the comment that there were sure a lot of lonely women in a town near to us. Then, I saw an email opened and it was something like, " my husband is out of town again...come do me". But I think it was a generic email sent by the site to attract people to come back? But I am really worried that he will go find someone else. Maybe I am boring? Maybe he is tired of doing the same girl? We have been married 21 years. He had an affair 9 years into our marriage, and I believe he hasn't done anything since then. But I am always a little nervous about it. So my question is.....can a guy have sex with his wife every night and still be getting it down the road? Or would the average guy be too tired to do that?

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