"There is no higher pleasure...That means a great deal, Bellatrix, from you"

What do anda think Voldy meant when he berkata this? What could be be referring to as the competing "high pleasure"? Torturing people? Something lebih lewd/banal, like receiving affection back from Voldy?

I've been meaning to ask this for ages, and have wondered about it ever since membaca DH.

Let's ignore Cursed Child momentarily and base it off the original series.

Thoughts and musings?