If you're looking for manga similar to Colette Decides to Die: Konin-hen, you might like these titles.
"How long can a human being keep their senses after consummating with the God of Lovemaking?" Saint Roya only wants one thing in life: to lose her virginity. Unfortunately, as the Saint of Fertility... that wish is off the table. Or is it? When she summons the God of Fertility, but the God of Lovemaking shows up instead, will she give in to her temptations...? Even if her choice puts the country in danger?
Shiina Momose doesn't believe in fortune telling and the occult, but for some reason, she can destroy anything with a touch. One day while on her way to school, a young man approaches her and claims to be a God. Furthermore, he believes that he was guided towards her and for that reason he has become convinced that she should become his first follower! Naturally, Momose refuses; but when strange things began to happen... she can not do something about it!
With the protection of that prediction, the days of protecting him has started! A love comedy of the god and human who were mysteriously put together!
Tsukasa wanders into a deserted, run-down shrine, and gets "spirited away." He is caught in a predicament. He gets assaulted, his clothes taken off, and then sucked... It's the only way he can get back to the mortal world. He tries to resist at first, but with his life on the line, he places himself in the god's hands. What will happen to Tsukasa's chastity when he can't go home unless he makes love to a god!?
Hades refuses to give up his life as a single god, unconvinced that love and marriage are worth the hassle. But when Eros shoots him with an arrow of love, will he be able to avoid falling for the next person he sees?
Kazusa has been in love with a boy since she was very young. However that boy will live forever in a state of youth as punishment for a sin he committed. And Kazusa is not without a sin of her own.
Keiichi Morisato was a typical college student, a failure with women, struggling to get through his classes, and in general living a pretty nondescript life. That is, until he dialed the wrong number and accidentally summoned the Norse goddess Belldandy. Not believing Belldandy was a goddess who could grant his every wish, Keiichi wished for her to stay with him forever. As they say: be careful what you wish for! Now bound to Earth and at Keiichi's side for life, the lives of this most un-normal goddess and most lucky human will never be the same again.
Goddess Pandora was sent to Earth to collect "gifts" that were spread among humans. She has a nice body that can tempt anyone who looks at her, but when she uses her powers, she shrinks to a young girl's body. The only way to gain her power back is to kiss her reluctant peon, Aoi.