Fuck yes!
I don't think my wife ever really tried to hide it. More of an uncertainty in her own mind and some anxiety, along with a building arousal, all before very much embracing and induging in it.
This is why we go to many parties.
Honestly I’d probably try to stay out of sight so I wouldn’t interrupt them. Then hopefully just watch as they explored each other’s bodies. If I was lucky I’d watch as my wife reached down his pants and pulled his cock out. Then hopefully watch as she gets on her knees and takes his cock in her mouth.