Threesomes

What would you do if your spouse or significant other asked for a threesome. Men ask this of there loved ones all the time and while it is a social taboo my question is why. Why is sex a purely physical act so important to a emotional relationship that the thought of doing something to add to the purely physical part is a big deal. Sex is fun and can be had without a emotional response. An if you are comfortable in your relationship added another person or persons can add a whole different experience. I do feel guys need to be more open to letting the woman having a threesome with another man and stop being so selfish. As a whole society needs to relax the emotional attachment to sex. Treat sex as it is a purely physical act that feels great and the more fun you can have the better it is.