Tips on Lasting

So I sent my man an e-mail with the link to a website I think he should check out on tips to improve prejaculation because we've been together 9 months and he still gets off in a very very short period of time...like 3-6 minutes... and I want to work through this with him. Even during round 2 he gets off quickly..

Guys, what would be your take on your GF sending you an e-mail for help tips?

We've talked about it, and we both know it should be improving by now, but it hasn't and I really feel it's mind over matter....

Tips, advice?