According to Banfield (The Mammals of Canada), via the Fletcher Wildlife Garden website:
Eastern cottontails breed in late February to early March and continue until September. Courtship is said to be quite energetic. Banfield (1974) describes it as an "interesting mating dance" in which "the buck chases the doe in a lively pursuit around the meadow. Eventually she turns and faces the buck and spars at him with her front paws. As they crouch facing each other, a few inches apart, one of the pair suddenly leaps about two feet in the air and the other runs nimbly underneath it." This usually occurs after dark and may be accompanied by squeals and grunts.For about ten days in March these two rabbits (Sylvilagus floridanus) met in the backyard every morning to do their crazy dance. A photo doesn't do it justice--this is the "staring" portion. The rabbit on the left is the male, as per Banfield. Another rabbit--larger and with a broader, redder forehead came by sometimes too, but I never saw it interact with either of these two.
Of course indentifying individual cottontails is a pretty speculative business. Their coats vary enormously, I've learned from having the opportunity this year to see some together, but they also vary seasonally, and I have no idea how many are as grey as the fellow above, or as brown as the gal--so perhaps I saw ten courting pairs, not one on ten occasions. In any case, it's been fun to have them around, putting on a show we can watch through the back window.