I like your perspective. Monogamy is a way of living in a couple, but it's not the only one. I think we can have sex out of the relationship, but this must to be dealed with our couple. In my relationship is allowed, but we have not used our coupons, because we haven't had the desire. Our fire is still alive. If a couple is sexually bad, maybe they need to learn new things (with others) to improve their situation.

Sexuality is a complex topic, and we become it more complex in the practice. Sharing your body with another body must be great, but many times we are thinking in doing the things well, and we mustn´t to think while we are enjoying in the the bed (or kitchen, bathroom, the park, etc) . It's the opportunity to let out passions to drive and they need to be free. If we think that sex is bad, they won´t be free and we won't enjoy.