What's up with that

So I've been seeing a lot of posts of boyfriends/husbands being upset that their pregnant lover won't have sex with them. 
Well I'm in the same boat as well. 
My question is WHY on earth are they mad and upset in the first place? We are pregnant and uncomfortable. 30 weeks & I have no desire but my SO makes me feel like complete shit for not wanting it . 

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