As i said previously, the police in Sweden are not allowed to do these kind of "stings". It is arguably a weakness, especially when it comes to much more serious crimes, and they have discussed giving the police the power to do engage in it for decades. If the police are given the freedom to engage in "crime provocation" it's likely, at least initially, to be restricted to more severe crimes than "statuary rape".
But this does not prevent private individuals from engaging in it on their own. By chance i just saw a report in one of the major newspapers from last year where they pretended to be a 14 year old boy on one or more of the major LGBT+ meeting places online.
It's illegal to have sex, or to seek to have sex, with someone under the age of 15 in Sweden (although in practice it's difficult to convict people of the latter). Despite this, perhaps not very unexpectedly, they managed to get in contact with over 100 individuals who continued to maintain contact with the minor when it was revealed that he was under 15.
Not all of the individuals were explicitly seeking to have sex, at least initially, and out of the 30 individuals they highlighted (as is typical they were anonymized, we have a culture of privacy and personal integrity that also extends to people who do things like this) quite a few apparently made clear that anything that happened was if the "victim" wanted it. Others seemed far more aggressive and unrestrained.
As for the individuals background it included, again highly unexpectedly, people from all walks of life. A few were convicted of sexual offences, but most were not. Some of the more interesting ones included a senior official in the foreign affairs department, a guy working in military signal-intelligence, a married couple (that wanted to wait until he was 15 before they had sex), a medium (yes that's right, it said he worked as a medium), a senior official in Stockholm Pride.
What's so telling is how indiscreet these individuals are, even if they are not explicitly seeking to have sex. Just because it's not the police on the other line does not prevent them from potentially facing blackmail.