The phrase people use to find a board like this one gets typed two ways, and both of them are in use. One is sex tutvus, which keeps the English spelling of the middle word. The other is seks tutvus, which spells it the Estonian way. The meaning behind the two is identical, and a search engine treats them as near neighbours.
What the phrase means
Tutvus is the noun Estonians use for getting to know someone, and it turns up in dating contexts the way the word dating does in English. Put it beside the word for sex and you have a phrase that describes meeting someone for sex, with the emphasis on the meeting. It is a search phrase, so it has no verb in it and no politeness either.
The same root appears across the board. Tutvuma is the verb, tutvumine is the activity, and a tutvumisportaal is the sort of site that hosts it. Once you can see the root in a word, the rest of the Estonian around it tends to follow.
Why the two spellings split
Estonian takes English loanwords and then spells them the Estonian way, which is why seks exists alongside sex. The Estonian spelling follows the sound of the word: an Estonian reader pronounces seks and sex the same way, and the version with the k is the one that fits the language’s own rules. English spelling survives in plenty of places at the same time, especially in search boxes, because people type what they have seen on a screen.
The practical result is that both spellings bring people to the same two shelves of this board, one landing on the side written by women and the other on the side written by men.
What else people type
The searches that lead here are not all built on the same word. Some are plain: tutvus on its own, or a town with the word beside it, as in tutvus Tartu. Some describe the board itself, as in tutvumisportaal, or name the kind of adverts it carries. Others put a place name in front of the word for ads, which is kuulutused.
A few of these searches return very little. Adult advertising is one of the areas where search engines hold back on the volume data they publish and where results are less stable than in other subjects, so a query that brings a page of results today may bring a different page next week.
Getting to the English side
The addresses are built to be typed. Estonian pages sit under /kuulutused/ and the English versions of the same pages sit under /category/, with the same key after the prefix, so a search result in one language can be opened in the other once you see the pattern. Place pages follow it with /asukoht/ and /location/.
The board also keeps a language switch in the header. Clicking it changes the address as well as the wording, so the version you end up reading can be bookmarked and returned to later.
A search is not a sentence
One thing worth saying about this vocabulary is that the phrases in it are not the way anyone speaks. A person looking for an advert will use them in a search box and then never say them out loud. The adverts themselves are written in ordinary language, with towns, ages and what the writer is looking for, and that is the vocabulary worth having when you arrive.