Something that you just don't understand?

It is interest in exploring such things. Also, it is enjoyable for quite a number of people. It doesn't really have to be MFM; it can be FMF. I think it is alright as along as both sides consent and are willing to try things.

basic math https://media1.tenor.com/images/3eb6c51b571ec63b7f9fc230adebce09/tenor.gif?itemid=15278676

I think it's something to be careful of though, I would imagine that it would require a great amount of trust in order to maintain relationships like that. But as for me it's not something that I want to participate in, I would rather just keep my partner to myself in that way y'know?

I don't underestand... WHY ON EARTH DO BLACKHEADS EXIST? It's hard TO TAKE CARE OF YOUR SKIN to avoid blackheads and pimples. And no, there is no such thing as naturally clear skin, because that's stupid. You need to take care of diet, allergic reactions, effectiveness of products, and proper care for good skin. There is a difference between clean skin and beautiful skin.

@matchesia It depends on the relationship of the partners and openness to such activities. For some, it is 100% not allowed, and for some, it is something interesting to explore or to do. There is nothing wrong with not being willing to do it, because it can cause problems in relationships too. In other cases, it is a fun thing for couples and try may enjoy it. It doesn't always require a great deal of trust. Threesomes aren't really open relationships, as they can just be a one-time activity. Open relationships can help a relationship at times too. They aren't horrible or crazy ideas. It depends on what the person prefers and what they can handle too.