There's little "old-fashioned" about the duties and responsibilities of marriage.
Put your penis into a woman absent prior surgical intervention, and a baby may result. A wee person, with needs greater than your own.
You probably wouldn't walk on past a baby abandoned on the street. I'm guessing that's the case.
But every single time you insert pin A into slot B while deluding yourself that that bit of latex over pin A somehow "protects" you from the very well known consequences of sex, you're a liar and exactly the same as one who walks past a squallering infant - except that in this case, it's your own child.
And fuck you. I don't have a gender, I'm not a noun. I'm a person who is a man, and that is my sex. And my sex defines who I am in the broader social order - I am a son, a brother, an uncle, a father and a grandfather (I'm neither of those two last, but I have working testicles so I could be which is all my point here - potentiality)
I have no time for this magickally thinking corpus of bleaters who believe that somehow, saying lies to themselves make said lies true.
To recap for the haters and the ostriches: every single time you put your pecker into a woman's body, and you have testicles and she has ovaries, you are making a social contract to build the damn world.
You can easily, or not so easily as per your personal constitution, walk away from this awesome responsibility - many do - but it exists nonetheless.
And to you younguns, who think it doesn't matter - think again. All the joyful humping you do now indiscriminately will, in fact, come back to haunt you in some way.
Hope that helps.