The Kiss (1897-8) by Munch 

Michael Cunningham, author of The Hours, answers in a Guardian article:

[Virginia Woolf] wrote not at all about sex. Her entire body of work contains two romantic kisses – one in The Voyage Out, another in Mrs Dalloway – and after those two relatively early books, no erotic episodes of any kind.  

You should also read Cunningham’s brief discussion of teeth and (in)sanity.

so that they would kiss every time one turned a page.-Cunningham