Riverside Studios, LondonKeelan Kember's latest is so full of funny one-liners and cheerful performances it feels like a comforting sitcom Breezy conversational chatter, dry one-liners and sweeping generalisations about the sexes reign in Keelan Kember's new dating comedy. Having transferred from the King's Head theatre, the highest stakes here concern whether or not to get breakfast the morning after. Two young men,…