ISTP, or INTP depending on who you ask around here.
What are you passionate about?
The cool stuff. The big projects... people hand me a cool idea and I feel compelled to make it happen. Almost nothing else gets me passionate more than a challenge.
It can be a game, it can be something arty, it can be sports/physical, it can be intellectual.
How strongly do you feel passion?
When it comes to the above, strong. All consumingly strong at times.
Is it easy for you to become passionate about something or does it take some time?
Instant, but it's not the "emotional passion", it's more like being posessed. I don't leap into it right away, but it does consume my thinking. When I get down to doing it, it's long hours that take precedence over anything... including eating.
How quickly do you stop feeling passionate about something or do you remain passionate forever?
Always temporary. Until it's built, or until I lose interest.
Are you passionate about a great number of things or just a few?
Just a few - normally one - and they are always serial.
Are you more passionate about subjects/things or people?
About subjects and things, never people. I feel almost no emotion towards people at all.
Does sexual passion come easily to you?
No, not really.