A big "yes" to SteveR's comments.
When I first got my PPL, I took lots of friends flying, and they enjoyed it very much. One was so taken with it, he went off and did his own PPL and now has his own very fine aircraft (and lives in the USA).
BUT ... and the reason why I would say be VERY careful ... a friend of mine, a large, strong chap who would make an unbeatable rugger player, went very white and petrified when I took him flying. He "froze", arms outstretched and locked on the coaming.
If it had been the yoke he locked on, I wouldn't be here now. As it was, I made a "PAN" call and made some extremely gentle turns to get back and down asap.
And he is NOT coming flying with me again, despite all the "I'll be OK now" pleas.
I'd suggest take no more than two, and make sure anyone who hasn't done it before, or who doesn't look like the "natural" type, is in the back where he can't do so much harm.