Blow-up dolls

I went to my local sex shop last night to get a new blow-up doll. As I was looking at them the clerk came up to me and asked if I needed help? 


I said yes and he asked if I wanted a male or female? 


I said a female and he asked blonde or brunette? 


I said blonde. Then he asked Muslim or Christian?


I asked what's the difference? 


He said the Muslim blows itself up.