Do your best to have her make friends with a lesbian, or bisexual. Watch lesbian porn together.
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You might offer to sleep with her and another guy or two. She may be open for that before she would add a second woman. A second guy would not be as threatening. Besides, it's fair.
That would be a personal choice for your wife. If you're interested, you should talk to her about it. You do not control her sexuality, so don't attempt to coerce her.
No, only Jetta.
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* If you are legally separated then no, you are not cheating by sleeping with someone else, but remember ... she could be doing the same thing.