He kissed Rose to transfer the Time Vortex into him, which caused his re-generation into 10.
Well, that was the excuse, but was that kiss really necessary? It looked to me like the Vortex transferred via their eyes.
I may be wrong but I imagine any initiating of kisses between River or Amy with the Doctor will be their doing not his.
Yep, I agree. Amy's had her shot, now it's River's turn.
His
allure is hardly his fault
Oh I know, he's too cute NOT to kiss!