And keep the back door toys, fingers, tongues, and tools away from the front until they've been properly cleaned and condoms are a good thing - easy to remember front/back.
Does it feel good
Carp makes a good point, Dread... (and E&B also)
Once you know she's good with it, here's a very important key: lube. LUBE.
I hated when I'd be in the groove and the guy would just get to putting his dry little Jack Horner thumb in my bottom DRY. Just no. fuck no.
Ruined the doggie groove. I'm out of the zone, have to switch mindset from "oh, yes please more" to chastising and protecting the end zone in zone D. Just no. Swatting hands away like annoying boney flies. sigh.
Permission and Lube, boys. permission and lube.
Ask first some ladies it's a no play zone. Never heard a cold dildo before sounds interesting.
Does it feel good when you get hit from behind and he stick a finger in your ass