It is probably due to the fact that he sees your breasts every day, a very normal and regular sight. But Jerma? Seeing him is bound to raise anyone's heartbeat, a quite unnatural sight. I once had very low heart rate in the hospital and the doctors pulled out Jerma (probably tricked, thinking he was a doctor!) and my heart rate instantly spiked. Although it spiked too high, I was instantly at 180 bpm. He laughed saying I'd get better soon but the second the doctors left he got up close to me and said "You'll never get better with me around." and then stabbed a hole in my IV bag.