All my life I've wanted to save myself for marriage.

Now that I'm all grown up, I'm thinking harder about whether or not this is just a fairytale fantasy tradition and couldn't possibly work in real life without potential troubles. I know the main reasons for divorce is money and sex...so i don't want to even risk us breaking up.

I am against marriage, i do not want children (ever), and the only reason for me to get married would solely be for sex and being dedicated with that person forever. I don't believe in divorce, a promise is a promise!

I have a few questions and fears.
Are some people physically incompatible purely based on body shapes and sizes? Or is the vagina malleable enough to accept any shape?

I'm scared he won't be able to give me pleasure or I to him- and I'd hate for that to be a petty reason to leave him even though it's both a very big part of who we are (we're both very randy people!)

I realize that good sex takes love and practice. If i try it out at the honeymoon that's almost guaranteed to be bad sex, and might make me upset. If i try before, it might put me off him a bit. Or if it's good make me feel more wholly dedicated to saying "I do!"

Can any incompatibilities be worked out? Or only some or most?

These are my arguments for and against:

FOR:
INCREDIBLY romantic and poetic-I love the thought that my husband received such a gift on our most special day and remains to be the only human I'll ever have that deep a connection with.
No fears of pregnancy...STIs (for the most part, i know on rare occasions people can catch things from public toilets etc...)

AGAINST:
What if we are not sexually compatible? Sex is very important to me. I'd hate to be stuck with him forever if we couldn't fix things.
I am willing to marry him sooner than I'd like just to have sex, potentially marrying the wrong person or moving at a premature pace.

I'm quite confused...I'm having my own high libido cloud my thoughts (I'm thinking i should try before i buy now-but only after we are engaged officially- i told him he can't ask me until we've been together a year).

I always thought i could sleep with him a few months before the wedding, but then i wouldn't want to marry him anymore, because the only reason I'll marry is for sex. As I don't want to be trapped with someone unnecessarily (just in case it doesn't work as i refuse to divorce unless it's dangerous). I know it sounds bad but i was raised very religious and i can't bring myself to have sex before marriage. But i don't want to be stuck in a terrible marriage with bad sex.

I'm CONFUSED!
Help me please! I know ultimately it will be my own decision, but I'd like to hear some opinions and points please