Wow, great topic...
I am a widowed father, 3 grown sons (1 grandson). Bi (I prefer the term 'sexual')
I did have sexual encounters with men while married (safe always) high sex drive here. Did she know? I strongly believe she did, it was never directly address, but I know when pregnant she said 'be sure to take care of yourelf....'.
now that she is gone- the thought of dating a woman...not there yet, sexual situations- yes, but dating? Survivor guilt? maybe. she was the 'one great one' I believe.
A few years ago I had a 'bad luck/great luck'- my son walked in on me (the dog had a rawhide and didn't bark), so I was 'busy' watching porn, riding a (large) dildo, happily 'engaged'. Long story short- we wound up having an amazing conversation- seems my middle son (the youngest twin) is also bi. We have really bonded, and it also seemed to relax/open up my relattionships with my other sons. (not in a sexual way but in a 'we are men, with hormones' way.
I wish my sons to be happy- wife? parter? as long as they are happy.