Maybe use the 2004 Dr Octopus as the 'If you reach this, you've gone way too far'.
There's the 'subconscious/base instinct' route, where they can act on their own if he's not controlling them, but not directly oppose his higher brain. The fine details of how horny/persistent/etc they are is up to you, but they will stop at whatever point you deem too dubious.