With nymphomaniac being female, what would the male equivalent be?

Satyromania or Sytariasis. The sytar were forest dwelling goat-men who would get drunk and chase the nymphs.

Satyriasis

"[satiriyasis] Pathological exaggerated sexual drive or excitement in a male. Some individuals have an associated psychiatric disorder. Treatment has included behavioural approaches, psychoanalytic therapies, and the use of female hormones in extreme cases. The corresponding drive in females is known as nymphomania."

http://www.thefreedictionary.com/satyriasis

note, that is the word for the condition, would the man affected be called a satyr? (satguru)