Is it true that T-Rex had basketball sized testicles???

I was at a museum the other day where they have dinosaur skeletons on display. I've always wondered since Jurassic Park came out, did dinosaurs have balls? I mean, being as tough and mean as they are always portrayed to have been, one must assume there's some major testosterone flowing there. So anyway back at the museum, I asked the tour guide if T-Rex had balls, and if so, what were they like, I.e. Size, location, etc. so the tour guide was pointing to a spot below the pelvis on the skeleton, and said that his testicles and scrotum would have been hanging right there, and would have been the size of basketballs. I asked if it would've made running difficult and she just said that with millions of years of evolution she was sure that nature had worked that out.

So I'm asking, was this tour guide full of shit, or was T-Rex really swinging death? Because I can't find anything that 'swings' either way.

Thank you.