1 Shakespeare: So, you would consider a... tryst with Mr Pakington?
2 Mrs Arden: How dare you! To speak of such things openly!
3 Shakespeare: My apologies. I forgot myself and appropriate social graces!
4 Mrs Arden: I’m hoping it’s more than a tryst, if you know what I mean...

I tried looking up some subtle allusions that the real William Shakespeare used to refer to sexual encounters in his plays.

The problem wasn't that there weren't enough to choose from, but that none of them were what you'd call, you know... subtle.