No wonder why people are so confused in their "relationships" these days. This is absolutely ridiculous. If a guy (or girl) "doesn't want anything serious" then they shouldn't be in a relationship period. People should be either strict friends or dating. When the lines start blurring is feelings start getting hurt for no reason and the person who is feeling more serious about the relationship starts getting jealous/possessive/insecure about the whole thing.
Of course. Just neither of you date anyone else. Easy.
If you're monogamous, its usually public knowledge. It doesn't mean you're planning a wedding. It means that if one of you wanted to fuck someone else, you'd need to text the other first saying 'I dont' see this working out, I hope we can stay friends'
There's no rule to this. It's between the two people in the relationship. There are serious relationships that are open and allow their partners to see other people. There are non-serious relationships that are two people dating exclusively. It just means that you're not going to be with anyone else, but it doesn't have to be a "serious relationship" for someone to want that.
I think that's still possible. If the relationship is agreed to be 'open' as in both individuals in it can sleep with others, yet remain 'monogamous' in a non-sexual context, I guess that would qualify as 'non-serious but still exclusive'.
I've never had such a relationship, nor do I plan on it. However, from what I read or hear about from people who have 'open relationships', that's basically how it works. They're cool with being able to sleep with whoever they want because they know that, at the end of the day, they're still coming home to each other.
I don't see why they should be? A fling isn't really important 1 year from now, why limit yourself? Disclaimer: I've never been in a non serious relationship past highschool. So, to me, I don't see the point I guess to be exclusive if it's not serious.