You posed the question so I will answer... No, it is not ok for my W to have single male friends exclusive to her. WE can have male and female friends as a couple.
As for setting boundaries I can only go by my experiance. I set the boundary NO OM! no if ands or buts. I can't help but think that fighting for your W and MR by setting clear boundaries that pertain to respect is VERY attractive. Allowing an A and acting "as if" while allowing it to continue is sooo unattractive. Just my opinion. It means you don't respect yourself. That you will put up with any behavior to save M.
Did it work for me? Yup, so far. Not braging, it just has... Maybe I'm lucky. Dont know. Will it work for everyone? Probably not...
I guess it's all in where your tollerance lies...
M: 42 - W: 41 - M: 18 - T: 23 - D:16 S:14 EA - July 2010 NC w/EA - Nov 2010 Piecing - Jan 2011 I ask for div - Jan 2012 Div papers filed - Mar 2012 I move out - July 2012 Divorce final - Nov 7, 2012