More and more people on Ok Cupid (and other sites such as Plenty of Fish (POF)) use two different profiles.
One profile contains great photos and little information, while the other contains great info and vague photos.
When you find someone you like, you can inform them of your other profile so they can get a complete idea/look at who you are.
Originally pioneered by the gay community (particularly by gay men), online sex contacts are becoming more and more common among all kinds of singles (and attached people interested in a bit of side action! There are of course specific ways to go about getting laid with sex dating sites.
First and foremost, you need to remember that there is a person on the other end.
For 50-plus types unwilling to walk — possibly rewalk — the path that leads to romance, rings and relocation, the prospect of a "friend with benefits" is looking less and less like a millennial indulgence.