We are in a popular tourist destination, but with respect to this topic there's also many former tourists who now live here.
We receive a lot of bookings from people who are coming for a week or more, to meet up with friends, go golfing, boating, etc. They don't want to stay with friends. They book us. And yes, very often, they'll have their friends over for dinner and drinks. It's perfectly acceptable.
If you're a little perceptive, you can usually tell the difference between this type of guest and one who's attempting to have a party. The casual tourist with local friends openly say so, and are generally warm and transparent. The ones that are trying to arrange a party aren't up front about it, they tend to divert around pointed questions by not answering directly, and tend to word their sentences in ways that just imply they're not the first type of guest.
And age tells lot too. The older ones tend to have life well under control, and have nothing to hide. The younger ones exhibit bits and pieces of confusion, and aren't really confident about what they say. That's a telling sign. Young people generally aren't coming to golf and visit friends.