Because I feel like it. Here is my situation: There is guy I have been dating for the past 7 months. He made it clear early on that he doesn't want anything serious, so I consider him more of a FWB than anything else. We often do things that feel coupley- we go out on dates, we cuddle, have intimate conversations, and sleep over at each other's places- but I don't think his feelings towards me or lack thereof have changed. It's for the better, as we would not be compatible in a relationship.
But I love spending time with him, and we still hang out on a fairly consistent basis once a week or every other week. At first I was dating only him, but I was a bit unsatisfied because I would eventually like to be in a relationship that is actually going somewhere. So I decided to start dating other guys.
I went on several dates with three different guys and had sex with one of them, but it didn't go anywhere. Meanwhile, I continued to see my FWB on the side. I am prepared to break it off with my FWB once I find a guy that I am ready to get serious with, but I just haven't found him yet.
All of this in consideration, I see no moral issue with what I'm doing. Some of my friends don't agree with this. They think I need to make it serious with my FWB or end it, and only date one guy at a time. They don't say it outright, but basically they think I'm a slut and have no self control. My "number" for the year is a bit high since I had sex with three other guys before I met my FWB one was a drunken ONS that I regretted immediately after so I don't count it, but they do.
What would you think about a girl in my position? Am I somehow doing myself, my FWB, or my other dates a disservice by seeing multiple people at a time? How many partners in one year is too many? Maybe I need to reign it in a bit.