In the podcast "Sweet but psycho", Elin Woodie tells when a condom disappeared for her one night stand. In the end, there were three people who searched inside Elin to find the condom, which was apparently of the size extra large. Probably the guy could not match that size and that was why it came loose.
In the end, it was her friend Eila who found the condom that had gone all the way up inside Elin.