how to convince her
 

how could you convince youre wife to fuck other men,while you are watching.
probably not all wives will do this,but i think in their mind they would do it.

If it takes convincing, then perhaps she really doesn't want to. Some people actually do love the person they are with and can't imagine or want to be with anyone else.

others
 

maybe others who had a wife who became interested for this and how they get her so far

another possibility
 

see picture