I would suddenly start having startle reactions and stepping on his toes, to heck with sucking them!

I think you need a stronger boundary violation consequence though. Sounds like he knows the message but doesn't care? Whether you are a prude or not was/is not part of the problem. You have to have a consequence that you are willing to/can/are strong enough to enforce that he'll pay attention to or the situation will just stay where it is.