TL;DR - decent people just won't use "trap" anymore because it perpetuates a harmful culture that targets and
is currently killing trans people, so like just don't use it here in this manga thread please? And preferably not elsewhere if you so decide. I don't control you're decision making.
I won't assume you need a lecture, but I'm gonna explain for anyone who wants to read anyway, because i'm drunk and extra like that.
@angelonius exactly it's transphobic and a product of ignorant fear and toxic masculinity, by which I mean the fear of being seen as gay or emasculated by dating a woman. (If it sounds ridiculous, it's cuz it is, but there's alot of regressive assholes in the world that like to impose that closeminded thinking. It's 2019. They need to let their mind grow with the world around them already or shut up.)
To help better explain:
Trans women are women, so if in passing and acquaintance someone who is attracted to women finds a trans woman attractive, then it would not change this person's orientation. Nor would it be the trans woman's or the other person's fault if assholes make a fuss in regressive bad faith that forces this person to question their orientation or a trans women's identity; it would be the assholes' fault because they have a hateful agenda, repressed fear, or an inability to want to understand facts that go against the worldview that makes them comfortable, that is making them impose their unwanted and unwarranted beliefs onto others.
No one can force attraction, and no one is forcing attraction in trans communities, merely accepting their existence as men, women, or non-binary, etc. Again, people who say otherwise are doing so in bad faith for the reasons I listed above, and are the farthest from any adequate basic understanding of these social roles.
"But Lethe! She has a dick and I'm not particularly fond of the feminine penis! I love vajay all the way!" Some people might say.
look at me daddy i'm a fucking poet And that's great that these people know what their preferences are. However if someone is entering into a sexual relationship with someone, the good and smart thing to do would be to have conversations with their partner about those expectations and boundaries. Fun fact: there's alot of different ways to enjoy sex, and none of it invalidates a person's identity!
So it's a lie that trans men and women are "trapping" people into relationships, that would imply a power imbalance of a trans person having over their partner, and frankly, too many trans people are terrified of being killed by their partners (or just existing), or being rejected when they come out, for that to be the case. Calling it a trap or blackmail is just an excuse to blame them for the attack on them, and that shit's just plain old evil.