I've constantly raised that question to other Christians on internet forums:
"How can one measure sexual compatibility without actually trying it"?
And many believe that its something that one can tell beforehand without having sex, or that its something which "love can make the sex happen", or they think "sex shouldnt matter that much in a relationship, just the icing on the cake", etc,
I feel very uncertain about walking into a relationship with many questions about how the sex will be. In reality, sex and physical actions are the main things that differentiate a male and female friend vs. a male and female couple.
Whats the point in getting married if you are a Christian, but not having sex?
If I dont figure this whole thing out somehow, I guess I always could just say forget it, and not get married or have sex.