If you think about it, it's very probable that Tony has had sex with Jeannie's sister while he and Jeannie are married. Jeannie's sister was always disguising herself as Jeannie in order to get Tony, I'm guessing she continued this scheme after they got married..... We only see Tony's and Jeannie's married life for ONE season, and even then her sister tries to wreck their marriage.... So it seems likely she would continue throughout their marriage.... she was certainly still at it in the movies that followed.

There had to be times she got with Tony, disguised as Jeannie, and just didn't say anything more about it

If Jeannie's sister (Jeannie) did sleep with him, I'd think Jeannie would want to let it be known to Jeannie, to break up Jeannie and Tony. That would be just like that mean ole Jeannie.

She may have tried that, but I'm guessing Jeannie wouldn't blame Tony for it, since he was being tricked.... My thinking is, maybe Jeannie's sister finally gave up because she saw Tony ONLY wanted Jeannie, so maybe she just decided to reap the benefits of physically being with him

I can see that happening. One scenario would be Jeannii using the same power Jeannie has of putting Tony into two (or more) places at once, and taking of them for herself. She just would have to make him believe that they are having a weekend vacation on their island. She she blinks the duplicate(s) out, the original one with Jeannie would suddenly remember everything which happened, and Jeannie would have to confront her sister about it.

Jeannii could also make a fake Tony, one which was what Jeannie expected of him and take the real Tony. Hilarity ensues :-)

I can see that happening. One scenario would be Jeannii using the same power Jeannie has of putting Tony into two (or more) places at once, and taking of them for herself. She just would have to make him believe that they are having a weekend vacation on their island. She she blinks the duplicate(s) out, the original one with Jeannie would suddenly remember everything which happened, and Jeannie would have to confront her sister about it.

Jeannii could also make a fake Tony, one which was what Jeannie expected of him and take the real Tony. Hilarity ensues :-)

It's funny, it's seems Jeannie's sister had at least a strange sense of honor to her.... it seems she wanted to get Tony fair and square and really wanted him to WANT to be with her... I mean she could have kidnapped him if she really wanted..... and the time when she showed up and jokingly trapped Jeannie in the bottle, that would have been a PERFECT opportunity but she says, "That would be too easy" and let her out and passed it off as a joke. It seems she wants to make a love slave of Tony, but she also wants him to WANT it as well. Also it seems Jeannie's sister could have blinked up an exact replica of Tony who actually WANTED her if she really wanted to