GF won't have intimate relations with me?

I'm in a slight predicament. MY girlfriends pretty useless at sex and it’s got to the point I've snapped angrily at her a few times during. Once I slapped her because a bedroom argument escalated ( to do with swallowing). She has no rhythm and says the wrong things or doesn’t move correctly so my little man keeps flopping out. As a result it's totally put her off, I'm not getting any. She just has no interest anymore. I know it's not me because I have extensive experience, genuinely never had any complaints. What is the best way to coax her back into adopting a suitable role in the relationship (she should really be taking and enjoying anyway?
 
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