How do you romance Batuu sims off world?

So I went back to my "homeworld" and couldn't continue any of my romances with the sims I met on Batuu because I "couldn't get a signal" to contact them.

Does that mean I'm limited to basic romance interactions with the sims I meet on Batuu unless I marry them/move them into my household?

Like, I'd kinda like to invite some of my romances back to my place for coffee and woohoo.

First coffee, than woohoo.

Than the hatch back to Batuu.

Not a shotgun wedding...

edit: is there any woohoo spots in Batuu? I mean the chances are probably zero but...I have to ask lol.