Ketamine is very different from the main chemsex drugs, as it is a dissociative hallucinogen that distorts perceptions and creates a sense of detachment. Ketamine is used in chemsex encounters to "improve the experience of receptive anal intercourse or fisting".[10]
A study of sauna participants in Barcelona, Spain, in 2016, found that the most commonly used drugs in chemsex are "GHB/GBL, cocaine, ecstasy, silver bars (MDMA), poppers and Viagra".[11]
A 2014 study on chemsex in London, UK, indicated that the drugs associated with chemsex include mephedrone, GHB/GBL, crystal meth, ketamine, and cocaine.[10]
He's a catcher, not a pitcher.