Mermaids

So I'm testing codecs on the new laptop watching clips of random youtube videos and up pops Disney's the Little Mermaid. Now I have to say, for a half fish she's hot. Plus I have a thing for redheads. But I have to ask, how would one have sex with a traditional mermaid? I can understand the inverse mermaid (top half fish, bottom half woman) but that's not really something I'd like to think about and both halves smell kinda fishy.