Do you accept invitations out?

Hardly ever. I usually like to play mostly in the household's home lot. My sims almost never go out unless I want them to (like to go to a restaurant for example) because I don't like having to go through loading screens (they don't even go to the gym, as I usually build a home gym room in most of my builds), and when other sims invite I hardly ever accept and wish they would stop inviting them all the time. If we had the option to just send them without actively going there (kinda like you can do with GTW careers, where a pop-up window shows up to ask if you wanna follow them or just send them) then yes, I would probably accept invitations more often.