Yes he does have a crazy sex drive and all but sometimes it's because Momo made him angry and upset. He even seduces Yata too. If I may add he even said he likes it rough. Lol.
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And about the love part? How can you not see the extent of Yata's love? If he's only in it for sex he wouldn't have been comforting him, supporting him and getting worked up by him. It's hard to keep up with someone who has issues but he's still with Momo even if he gives him headaches. Geez. He would've left him soon enough after discovering about his past if it was not love. So please stop hating on go read a fairytale like Yaoi. Bloody hell, stop hating on something you don't understand.
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Author~ is almost always sick. Oh my. Σ(っ°Д °;)っ
Take care always sangsaenim.(⌒▽⌒)