Is it normal that my girl urges me to lick her clean after sex?

Is it normal that my girl wants me to lick her clean after sex? We are steady and she uses birth-control pills, so we don't use condoms. We have regular sex and I cum in her without a condom. The thing is, after sex she always asks me to lick her clean. She has me lick her cummy pussy until she has an orgasm. She will even have a *second* orgasm from this after having one during sex.
It doesn't bother me much to do this, as I enjoy her being turned on. But I wonder if this is something unusual. Additionally, when we are speaking our pillow talk about different sex things, she really gets off on talking about me licking her after sex, or licking her after sex with some other guy. (We haven't done this, we just talk about it)
Does my girl have a fetish about cum-eating? Do any other girls feel this way? Any other feedback in the comments would be appreciated.