Ik this is ask men but as a girl, my answer is companionship. That’s it. I grew up kinda not caring for marriage but you soon realize that everyone else gets married and ur alone if u don’t find the right person to spend most of ur time with. Also having a buddy, intimacy, and being cared for/caring for someone feels pretty good
1. If your partner dies it will be extremely hard for you to get their assets or life insurance etc 2. also if your partner was in a serious medical condition where they could not speak for themselves you would have no control to speak for them or be able to add it input 3. In the eyes of the law, bf/gf are not recognized so probably any legal issues as well 4. Probably much more I’m unaware of