It was during Thursday evening that the woman and the man met after booking a date via an online dating service.
The woman is then said to have been raped in her home, somewhere in the Gothenburg area.
Only when the man left the address could the woman call for help.
- The woman has initially been heard, says police spokesman Hans-Jörgen Ostler.
She has received the police's help in getting in touch with the health service and the police have worked with track security.
- In general, there are good opportunities to be able to solve such cases.
There are certainly all sorts of tracks and technical evidence, including being able to track through the dating sites.
At 22 o'clock on Thursday, the police had not yet been arrested.