Tight Vagina

My wife was a virgin when we got married.
We have been married 2 years and still have to use lube for sex. Even after awesome foreplay her vagina is super tight which makes me finish too soon.

I just read the tips for making me last longer and I am going to use them.

Is is possible that my wife has a small vagina?

Any other thoughts to make the sex last longer?

She is reluctant to get on top, but does like it from the back, not anal.

Help please:)

Have a read through this post on tight vagina.

Read through the entire male orgasm control section. Practice all the techniques, you can practice a lot during masturbation to prepare yourself for sex. No matter how tight she is, with practice you can have sex for as long as you want.