Luckily that's something you can actually work on.

Practice makes perfect

Pretty sure I read somewhere that 'soulmates' have the worst sex

Teach him! Unlike looks which are impossible to change and personality which is hard to change , a person's sexual performance can be improved through practice

So talk about how to make it better...surely he cant think hes that great if it was that awful? and if you cant talk about it..not meant to be. should be with someone you're comfortable with

The ability to love someone is also the ability to understand, and sympathize, with their, and your own shortcomings. Helping them through this, or finding an alternative, is also apart of love.

He's probably a Christian

How about working on it and maybe discussing it with him instead of bitching about it on the Internet.

practice my friend.

If you get with this guy, I sense a future cheater who will totally disregard all that "soul mate" bull shit she just rambled.