Well, lets see - from the tender age of 8 I've had my temperature raised - not lowered - by the coolness of the following hotties (in chronological order) ...

Kirk (what can I say, I was only 8)
Spock
Chekov
Spock
Riker
Spock
Picard
Spock
Data
Spock
Troi (don't ask)
Spock
Picard
Spock
Picard
Picard
Spock
Spock
Spock


Guess that makes it Spock, hands down.
Always dreamed of dipping those ears in my fondue.