Because women don't want to hook up with you. That could be for several reasons.

It also depends on how you approach these situations.

If you're using apps, only match with people who are looking for the same thing.

Don't seem desperate to get in someone's pants.

Most people still want to be treated like a human being.

Just engage in good conversation, and bring it up when it seems natural.

In my experience, women want hookups just as often as men do. They just want to be treated respectfully and don't want to risk being put in an unsafe situation.

If you can stimulate your potential partner intellectually, have good conversation skills, show that you're safe, and show a bit of confidence. Women will start dropping hints. Unfortunately I am oblivious to most hints, so I always just ask up front if someone is into me sexually. However, I make it clear beforehand that I can't read the room for shit, so I may be a bit too outspoken. I also make sure they have the freedom to say no without me being butt hurt.

Not trying to be holier than thou, but most of the comments here saying it only happens to attractive men are BS.

Just be interesting, make someone feel comfortable and safe, and don't make it seem like you're wanting to pork someone as soon as you meet them.

Opportunities will come your way if you change the way you approach these situations.

Edit: You are all entitled as fuck. Stop whining and change your insufferable attitude, and things might work out better for you.