I was rather troubled, and even frankly suspicious, about the apparent lack of sex in the case. But :

The Specter That Haunts the Death of Litvinenko - The New York Sun

Litvinenko certainly could have been contaminated well before his meeting with Mr. Scaramella. Several nights earlier, he had gone to the Hey Joey club in Mayfair. According to its manager, Litvinenko was seated in the VIP lap-dancing cubicle that later tested positive for Polonium-210.

It's a bit thin, but it's a start.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}