The point is, they put the effort into improving their appearance. They care about appearance. You don’t think that way because you probably don’t put effort into your looks, and you’re probably grateful just to have a woman willing to give you regular sex, because any woman will result in pleasure for you.
A relationship isn’t just companionship. You have to have a strong desire to get physical with the person. When you watch porn, do you spend 20 minutes looking for the perfect clip just to turn the screen off, and listen to it? Some people need visual stimulation. To expect a woman to not care about the appearance of a man they’re in an exclusive sexual relationship with is ridiculous.
No relationship is perfect. You have disagreements, the other person annoys you, they get sick, hear them fart, burp, poop, etc. Without that attraction, it’s going to be hard to stick around, especially when she can find 10 other ugly guys who will do what she wants. She’s going to make you jump through hoops if she’s not attracted to you.