I haven't recruited many companions to follow after 76 hours of gameplay, although I've done several quests which have made many more available as potential companions like piper, cait, strong etc. My first was obviously dogmeat, then switched to Codsworth. Now I've recruited hancock which is my first humanoid companion.

I've gained the highest affinity with him and got his 'isodoped' perk. There was also a romance option available through dialogue with him, but my character (as well as myself in real life) being male, I found it a bit awkward. So i wanted to know if all companions able to romance in the game can do so with a PC of any gender. Or are some of them strictly straight?

Gender doesn't matter in romance, no. The dialog will be mostly unchanged male or female.

That's interesting. Although I do find it bizarre that all the romance-able companion followers in the game are bisixual (if i could find a better word). There should be at least one who could have been straight, not that I'm against being otherwise.

I disagree with this, but for a gameplay reason. If you let the companions be romanceable by anyone then you have offered the greatest amount of flexibility to the player. Once you pigeon hole the companions you limit the player, which in my experience, is a lot less fun.

Yeah, that's been the subject of many discussions on this forum and probably elsewhere.

I'm with you. Adding to this, I feel like it might be better for the writers, too, since they don't have to think "okay, time to write the companion for gay player characters" or worry about making sure whatever their characters aren't poor representations or stereotypes. Bethesda's never shown an interest in exploring themes of sixuality, and the vast majority of stories and even romances get away with not discussing the nuances of sixual identities in whatever setting they take place in. (not to diminish the works that do go into that, though)