Hi,

I'm looking for manga that has a bi (or at least heteroflexible) guy and it shows him with both guys and girls. Shishunki na Adam is a good example. It's more hetero, but it has a decent amount of bi moments. I come across manga that has bi guys and even guys who were doing girls before the start of the manga, but usually once the actual manga starts it only tells about the previous straight stuff and shows only yaoi stuff. I would like if it shows the bi guy doing both.

I just finished reading Konna no Unmei Janai Kara Kanchigai Shinaide and the uke/omega is basically straight and before he was a playboy and throughout the manga he mentions he wants girls with big boobs, but it only shows sexy times with guys. When the discussion about pair bonding comes up, at first he says he wants to pair bond with a girl, but

near the end he says that if he does want to top once in a while his two alphas have holes he can use. I would've liked it even more if it showed him doing girls regularly but when in heat he goes to his alpha guy friends.

Thank you.

Fuck Buddy shows the two male leads having threesomes with women

but eventually they sleep only with each other.

Koi no Shikata ga Wakaranai stars a guy who goes out with anyone who confesses to him, guy or girl
Happy Shitty Life has two guys obsessed with taking it up the ass, whether it be a guy or a girl with a strap-on
Ogi-kun no Natsuyasumi doesn’t show the protag dating a women but he struggles with his bi identity (he mostly prefers guys)
Tokyo Super Darling has a bi protag who realizes he likes big butts regardless if they’re on a man or a woman
Me o Tojite mo Hikari wa Mieruyo has a bisexual male porn star with a child as the seme
You can use the “Bisexual Male Lead” tag to find more.

Does Kuro Gal ni Natta kara Shinyuu to Yattemita. count? It's a gender bender, but he does the 2nd MC as both a guy and a girl. That author does a few stories where the seme (and to a lesser extent, uke) are bisexual. Adding to calmpsalms suggestion, you can search "Bisexual Seme" and "Bisexual Uke" to browse more titles as well.

http://i.imgur.com/LxhWm.jpg (will reformat this some day…)

have you tried reading 10 Dance by Inoue Satou?