Yes talk with the boyfriend about sex life, great idea, while you're at it also have an extensive conversation about where this relationship is going, long term short term goals... plans and perhaps the promises of a future together... security, stability, the wonders of getting into a rut and staying there... monogamy, loving each other forever and how much he means for you and how much you love him...
the good news is, if he lasts through that horrible discussion, he truly loves you and he will top you more from now on, and if the discussion chases him away, then you're free to find yourself a truely versatile person.
Damn I am good at this stuff.
PS. Some people are not getting my posts, so I will ruin this one and say: For god's sake people, the grumpy old man thing is an act, it's supposed to be funny. :-) I kid, and I abuse you cause I am showing affection through the abuse. :-)