Wooo I got a....92 Apparently I'm "immune to the disease". Nah, I'm still romantic, just single and not openly seeking a relationship atm... Those questions were really weird, but oh well.
I'd say yes and no. In some situations it's almost spontaneous and unintentional. There might be a "trigger" of sorts that just causes the feelings of attraction to arise. It could be anything for anyone, we all have different tastes.
However it's controllable. As I said here I'm not openly seeking a relationship. There might be someone who comes along that stirs up those feelings of romantic attraction, but I'll probably ignore them. Sometimes, if you don't act upon it for long enough, then it'll settle down or go away. In my opinion, it's not really a drug in the sense that I always absolutely have to have it, and the minute the desire arises I absolutely have to act upon it. Every time I do, that is my own conscious decision.