So a complete 180 to the usual virgin/inexperienced!Sherlock headcanons, I want a Sherlock that has had plenty of experiences -- during boarding school with fellow posh boys, uni days with professors (some of them must've been brilliant enough to a young Sherlock), kinky stuff during his heavy drug use days, undercover at sex clubs for cases, etc.

John is surprised (and intrigued, of course!) that Sherlock only *chooses* not to engage in sex b/c he's got more interesting things to do. Cue John's obsession w/ bedding Sherlock the sex god.