We have a few couple friends as well, but then it gets complicated...
For instance, we are friends with our Pastor & his wife as a couple; I am also friends with the wife; I lead our youth group with the husband; my husband is friends with our Pastor & they get together most weeks for bible study and/or social; their eldest (nearly 17) is a friend of mine (and she's also a junior youth leader, so we get together in that capacity); the 3 eldest kids are in my youth group; my daughter is friends with (especially) the 3 youngest; the 2 youngest boys curl up on my lap for cuddles; the eldest boy is friends with my husband (and also does gardening jobs for us)...
It's not so clearly defined.
I guess we have friends who are single, friends who are couples, friends where the whole families mix, & couple friends who we have relationships with their kids too...
Yes, we have lots of lovely friends!