First things first, I couldn't think of a better title, sorry.

I am looking for a manga with 2 types of sex scenes in them. 1 heterosexual and 1 homosexual. The common theme is that both sex scenes have the same character. The more detailed the sex scene the better.

Surf Junkie, same character has sex with a male and with a female in ch5 I think (not at the same time, tho).

Instinct and a chromosome

Sweet lips

Octave

Hydra - One of the main characters has a relationship with a girl as well as a guy

Three and a Half, the first story. At the same time. 😲

Nightcap, first chapter. This is the third volume of When a Man Loves a Man, and this character, Iwaki, is also with Takaaki (and only him) in the other volumes of the series. They are all hosts who make their money off women, so there may be other scenes, but this is the only one I remember. BTW, Iwaki insists he is straight "except for you".

Haru yo, Koi - More than one character in the series explores their sexuality. I want to say theres 2 main characters that have sex with both guys and girls through the course of the series. Though the focus is on a hetero relationship.