Q: How do I get my wife open to the idea of having sex with other people?
A: If I had the easy answer to this I would be a rich woman indeed.
First of all no two women are the same, so what you have, what you see and what you think you want are all completely different things.
Some women require a level of trust with their partners before they even try a particular new sex act so things like swinging, threesomes, group sex and the like are no different. This is not a bad thing; some women have always been more open than others about their sexuality and or their willingness to take risks regardless of the male opinion.
Your wife or girlfriend might require a certain level of trust between the two of you before involving others. That is not to say she doesn’t trust you, it is just a really safe place for us women to express ourselves in a healthy relationship and the longer that foundation is there the more adventurous some women become. This is one reason why we see older couples involve in swinging and not a lot of young couples: they have pretty much worked out a lot of their relationship kinks and bumps and have reached an age and time where they are comfortable with their bodies/sexuality.
Roll your eyes all you want but some girls want to know they are going to be respected in the morning – the rest of us could give two shits what you think. Saying it is one thing, girls are not stupid, knowing it is a whole other situation and you have to give your partner credit for not jumping between the sheets right away because there is nothing worse than risking the one you love for an hour of extra cock.
I have seen it happen both ways: both men and women have been unable to come back from seeing their partner in action with someone else.