It was a VERY painful ordeal, getting circumcized when I did not give my consent.
My parents just thought it was a good idea at the time. It was VERY painful.
I don't wish it on anyone. Imagine attaching electrodes to your crotch and getting shocked every time you moved. It was traumatic for me as a three year old and and even at that early age I do not forget the pain.
But if it's what HE wants, well, the more power to him I suppose. I've had boyfriends "cut" and "uncut" and there really wasn't much difference to me. I wish I had the choice.
I'd say offer him to talk about it. Find out what he thinks and why. Give him your own opinion. If he wants to really have it cut, why not? It's possible to get the snip also for adults. No great deal.
I was told by a friend that it makes sex a little more difficult and also, it looks terrible...terrible, id hope to never be in a relationship with an uncircumcised guy. But if you are in love with him already then it shouldn't matter, so tell him that its no big deal