>>1867272Good answer. I want to add to it a little.
The influence of christianity in the west has generally painted sex as a bad thing, especially for the purpose of pleasure. Demon girls represent the opposite view - that sex is good, especially for pleasure's sake. The symbolism of these girls is meant to help us reject the teachings we have subconsciously absorbed through society. We want sexual pleasure and we have to accept what we want before we can enjoy it, even if that means abandoning cultural norms.
OP's pic goes even further using 666 and an inverted pentagram to make the satanic/anti-christian connection.
