Reflection of desire.

Reid: You're here to target a woman but you don't want to attract attention.

Hotch: Well, standing in the middle gawking at passing women is going to attract attention. [sees Reid gawking at passing women] Like you're doing now.

Reid: [snaps out of trance] What's that?

Prentiss: And just like that, [snaps fingers] an IQ of 187 is slashed to 60.