Re: This is serious!
Based on the OP’s post, the guy would have been trying to make his case for a second marriage and sex life is a valid reason for that, so sharing is not a problem here. It’s not like he would’ve been discussing sex positions 
As for the whole problem, I must agree with CM. I don’t know the in and outs of the story but based on what Rene has written, this marriage is not worth it. I understand why the guy is looking into the second marriage route because of family issues but really he should just divorce her ass.
PS. The whole thing about the girl being in depression is a load of bollocks, she seems happy enough in her own world and clearly does not care about what her husband is going through.