What to do?

I've been out and about with Martin inviting our customers to Christmas dinner parties and thanking them for the good business this year. A few nights ago I was in Manchester, this time the client was inviting us to their big do. The dinner was lovely I mingled with all the different buyers and other suppliers. However, much later in the night, my customer was very drunk and he was literaly all over me. I put him back in his place as gently as I could explaining that it would be very awkward talking about display cabinets if he went any further, even though he seemed cool about it, it still feels awkward. it also compromises my option of getting into sales next year. I don't know what else to do. If I choose to go into sales, I won't have Martin to lean on or hide behind when a customer makes it... difficult.