This draws heavily upon the fact that in the nineteenth century sex between men was referred to with the code word of "morbid," or "morbidity," because of the way that among lower class gay men venereal disease was widespread and often fatal.
-------------------------------------------
"You know what they call this, Holmes?"
"Mmm? No. So sorry, dear fellow, I wasn't paying attention."
"They're calling it morbidity, Holmes."
"The lower elements will destroy us yet."
"Not funny."
Holmes made a vain attempt to smooth down his hair. "Watson, get off my arm."
Watson rolled over. "Apologies."
Holmes sat up, sheets cascading off his bare shoulders. "So this is our death bed?" he wondered lackadaisically.
"It certainly will be if you're not properly awake and dressed by the time Lestrade calls about the Egyptian matter."
The great detective leaped out of bed, cursing loudly as he went.