Sexual compatibility is a very vital element of any relationship. This has nothing to do with the size of the vagina or the penis. You just need to be emotionally compatible with each other.
The best way to find out how sexually compatible you are with your partner is by having sex. After experimenting a number of times, you will discover each other's expectation during sex.
There isn't an established method to find out who will satisfy you or not, but below are some points you can discuss with your partner to have a better idea. Answer them honestly, and you will figure out what to expect from each other.
1.) Sex Drive Compatibility
This has nothing to do with love. Sex would be boring unless you have a similar desire for sexual activity. Do not neglect yourself just to please your partner; take turns to satisfy satisfying each other and you'll strengthen your bonds.