You must remember this: a kiss is still a kiss. Or is it? In what is being touted by the WB as the first romantic smooch between two men on commercial network TV, the gay teen couple on “Dawson’s Creek,” Jack (Kerr Smith) and Ethan (Adam Kauffman), will have their lips meet on the Wednesday night season finale. (Last week they went to the prom together.) While same-sex smackers may seem like no big deal — remember the one between Mariel Hemingway and Roseanne? Ally and Ling? — the WB maintains that this time the kiss in question is not part of a punchline or a one-time circumstance. Go for it, guys.