This is probably one of the biggest paradoxes between sex and Christianity. Lust and sex are bad. But it's also bad if آپ don't have babies, even though babies can only come from sex.
The Bible doesn't give very clear consensus about whether یا not Asexuality is a sin یا not. Beyond men having sex with other men, the Bible doesn't say much about sexualities at all. (Not that it really matters, because آپ shouldn't be basing all your morals based on one book anyway.)
I don't think any type of sexuality is a "sin", so long as you're not harming anyone with it.
EDIT: لنکس about Paul:
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