I will argue strongly for the use of playersexuality in games with romance, for reasons I've stated; most importantly that a character's persona and characterisation should not revolve around their sexuality, and that making it a defining feature of a character is a failure in writing... but I will definitely concede that at the moment, Gale and Wyll do feel a little bit jarring in this respect with male PCs.
The issue is neither their backstories with established romantic female interests, nor with their propensity to be more flirtation with only the females, and definitively not so with males (In running banter, Gale firmly rebuffs Astarion, and can do so before his nature has been revealed); it is the combination of both of these things together that make their accepting of your interest - or in Wyll's case, his expressing interest to you - feel a bit out of place.
Because the significant female figures are important parts of their back stories, I'd strongly recommend that there be some dialogue to counterbalance this when starting a romance with them, as a male PC. Something to acknowledge their past while affirming their openness to this in a way that makes smoother sense. Gale currently reads (to me) as the sort that likely *hasn't* had a same-sex relationship before; his dialogue could include references to his surprise at how he's feeling about this development, and perhaps even some witty intellectual banter about new experiences. Wyll, on the other hand, reads to me as someone who, IF he will accept interest from or express interest in a male PC, probably is well aware of his interest in that sphere already, and might instead have dialogue that notes why he projects only female-oriented interest outwardly (and when he thinks it's about his heroic image we can thoroughly disabuse him of that notion...).
One important thing I feel makes playersexuality work well (though this is harder to manage) is that the characters CAN have predefined leanings that they default to without the player, but that they shouldn't be dominant enough to be defining traits, and that they should only show up when the player isn't pursuing their romance. This helps divorce the concept of playersexuality from general bi- or pansexuality.
Either way - I can understand criticisms at the moment that feel their male romance paths feel very out of the blue or ungrounded to their character else-wise... and that's something that can and should be fixed.
Personally, I would like to have some references to the player's gender in some ways since the whole bisexual is pretty much just playersexual in-game. There is really no difference, they act and talk to you the exact same way, so I don't see how it adds more character to them, considered the only difference is that they reject you if they're "gated". At the end of the day, the whole gated thing essentially just limit the options for people whose features they don't even use, meanwhile, gated reasons ranging from arbitrary to downright offensive stereotyping.
