I really think the last thing you need to be worrying about is whether your wife is a lesbian or not.
I'm glad she wants to work on your M w/ you and, it will be hard, trust is hard to get back, trust me, I know. If you have chosen to forgive, it's a daily thing -- each day you may need to 'decide' and tell yourself that you are choosing to forgive your W. You will have good days and bad days. You will go through a grieving process -- the intimacy, special R w/ your W, etc. has died. You can get all that back though, but it's a process and sometimes not an easy one.
We've all snooped and yes what we find usually sucks.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10