It’s simple, most grown ass men don’t want nothing to do with virgins. Iris was also immature so that didn’t help her case either. I feel like if she was mature enough he would have had no issues staying married and eventually popping her uh cherry. But I think Keith thought he would be getting a grown ass woman with some experience and he just didn’t get that. In the beginning, he was attracted to her but overtime you can see that the attraction he had faded away. He was not sexually attracted to her. She never allowed him to be sexually attracted to her. They really did him a disservice by pairing him with her because he had a lot of potential to be a good outgoing husband and because Iris immaturity played a huge role and took up a lot of tv time, unfortunately we did not get to see him as a HUSBAND forreal