Is it normal that my girlfriend doesn't like touching slippery things?

It's not exactly what was in the title. Vut i couldn't break it down in another way.
The thing is, that my girlfriend and i have spoken about our bodies lately, what we like and what we don't like. Maybe should add she's still a virgin. We've also talked about what we like when we masturbate. And she said she only likes to rub the outside, that she once tried putting a finger in but she thought the slimy slippery viscous feeling was icky. I myself feel the oposite way... She's let me touch her down there and masturbate her a couple of times and i find the viscous feeling a huge turn on.