I think it's painful when what is thought as "normal" excludes you...
Having a family and being respected by society, if these are important to you and your culture, it wouldn't be easy...
There are battles that people is now fighting, for example LGTB rights and so.
Even if your aren't gay, there are persons who aren't against adoption but they do want a child of their own. Think of infertile women who want to have children, they wouldn't be happy with the news of not being able to have a child and with adoption being a difficult process.
It could sound silly, because family bonds don't need to involve blood, but there are cultural forces stronger than us. They just have to built a love, a relationship, a determination which won't be stomp by society... But it's not easy...
Anon hit the nail on the head.
Yes, i agree with you. i meant the part where they think "im a man, i cant get pregnant" is silly. because many people have trouble with that matter, not only gay men.
but whenever yaoi brings up that "being gay is so painful men cant give birth and have families" im like... yo... thats so silly.