Friends With Kids

[Cassparagus]

some background, me and my boyfriend live together, have a significant age difference and live an extremely career oriented life. we aren't big fans of kids, and most of our friends don't have them. however we do have a few friends who have them, and we also boat with his sister and her small son. (but we usually raft up with them).

my question is this: what is good etiquette when the friends with children want to sail or go out with us? to say we wont take the kids seems rude and may put someone out in terms of finding a sitter etc... but we also prefer not to have kids on the boat because of obvious safety reasons, and the fact that we don't have a very child-friendly boat.

has anyone been in a situation like this? and I'm newer to boating so im not totally sure if its completely rude to have a no-kid rule on your boat.