So… it’s working then? 
If there’s one thing men love, it’s being described as “adequate.”
That and “Good enough.”
Not as bad as, “Thanks for trying.”
“I’ve had worse.”
There’s also the variation that’s far worse, “It was a good try.” or possibly worse still, “You did your best.”
She said “definitely adequately”, which I’d much rather be called than “adequate.”
“Give it to me and give it to me with a Moh’s Scale of 5, baby”.
“Don’t be ridiculous, that’s not a penis pump. What kind of weirdo do you take me for?! It’s a blow-up doll inflator!”
Really?
“x-ray vision isn’t just adequate, he’s definitely adequate.”
Y’all are making one enormous, swollen, pulsing assumption.
You’re assuming it’s his.
Yeah, that’s right. Maybe it ain’t. Maybe the OP is a beard. I’ll leave you all with that thought for the weekend.
I got yer enormous, swollen, pulsing assumption right here, baby!
At least, that’s what your mom said. 
No one talks that way. They do talk the way the OP did. She said he “doesn’t have any problems getting an erection and performing with me, and he’s definitely adequately sized.” The definitely there implies that he’s more than adequate.
Wow, guys. This is both incredibly funny and helpful! Thank you so much for both telling me why it was used, and then giving advice on how I could approach it. I still haven’t said anything to him about it, I think I’ll let it naturally come about and see what happens.
Finally, x-ray vision interpreted my words correctly…I was trying to be coy, people!
Isn’t it obvious? Baby Plays Around.
mmm
All of these are better than “Is it in yet?”
Which is far better than “what, you’re done?”
why the hell is the penis pump pink? That’s what I want to know. Is it supposed to look like a hoohaw?
Moses and Aaron on a stick, I would drop dead on the spot.
No, it’s supposed to look like a vagina.