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I tend to go for more muscular seme and uke. Somehow I also love piecings. XP Also when the couple dont act a lovey dovey. When I first read this I imagined Levi and Erwin from attack on titan doujinshis!
Lol i almost ask a similar thing. (≧∀≦)
Anyways, my likes influenced my list creations and i mostly go for a middle-spectrum uke and seme. In other words i go for the manly couple type and switch pairs. Power couple too, especially if both are elite salarynen. Better if they are bosses.
I like slice of life, working couple (so I want my seme and uke to be appropriately manly). It's even better if the uke is mentally insecure about gay relationships (coz that usually lead to angsty plot progression and I love angst).
I'm not too picky about my couples actually. As long as they're not too girly. I'm just quite picky with plot and the mood ambience in the manga.
I know what you mean, I love ukes with brown hair, but in general I love guys with brown hair, so that's probably cause. It's not a dealbreaker for me, but I definitely prefer the ukes to have brown hair and the seme can be lighter or darker, I don't really care. I also love semes that are really devoted to the uke from the get-go or possessive of them.
Question for discussion: have you noticed certain characteristics in the kind of pairings you enjoy or tend to ship?
On a completely shallow and IRRATIONAL note, I've discovered I cant really enjoy a BL sex scene if the seme's hair color is lighter than the uke's. They can both have light hair or dark hair but if the seme has dark hair and the uke has light hair the sex scene just wont work for me!!! That doesnt mean I won't read dark-haired-seme/light-haired-uke manga but I probably will skip any smexin. I know I know my brain is broken. (I also read yuri/shoujo ai and straight pairings but this weird hair color issue isn't a problem for me in straight or girl/girl ships)
Also I tend to like childhood or best-friend pairs, pairs where one character is very devoted or pining, or pairs involving atypical gender roles (e.g. tough and manly uke in BL, or a crybaby guy in straight pairings) I also like reading about fucked up dysfunctional pairings but in that case both characters have to be fucked up. Not a fan of stories where one character is a total asshole and the other character just gives in and goes along with it.