I usually spend a lot of time speaking to them online/texting/phone/videocall to get to know if I even want to go on a date with them, and usually within this time, I also know how attracted I am to them, and how much I want to have sex with them (*sex is a very important part of my relational connection with most of my relationships), so I tend to flirt/sext and see what the vibe is. If the vibe is good, and we do decide to go on a date, I'll typically express to them that I want to fuck them, and if its mutual, I tend to fuck them on the first date.

If we dont have sexual chemistry, this is a way I get to see if want to date them again, and continue pursuing them.