The Snake Wife
The Snake Wife (1994) : Kwan discovers her husband is married to another woman plus has a child with her. In retaliation she becomes romantically involved with a deadly snake (we don't know quite how that works since we haven't seen this) and a series of serpent deaths soon follow.
Lust
Vipers
The Taking of Deborah Logan
Snake Monster
Python
Anaconda 3: Offspring
