Man-eater and vamp are a little bit "slangy" compared to

seductress - a woman who seduces someone, esp. one who entices a man into sexual activity

Per Neil's comment to the question itself, bitch isn't really relevant to the meanings involved here.

Per comments/discussion below, it's probably impossible to come up with a "feminine version of womanizer" that only switches the gender without implying other differences. Language reflects social attitudes, biology, etc., so even a structurally trivial distinction such as seducer/seductress unavoidably entails gender-based preconceptions that OP is probably seeking to avoid.

In the noble spirit of one immortal oratorm when he so colorfully advised our hero . . .

This business is well ended.
My liege, and madam, to expostulate
What majesty should be, what duty is,
Why day is day, night night, and time is time,
Were nothing but to waste night, day and time.
Therefore, since brevity is the soul of wit,
And tediousness the limbs and outward flourishes,
I will be brief: your noble son is mad:
Mad call I it; for, to define true madness,
What is’t but to be nothing else but mad?
But let that go.

. . . I can myself do little less than recommend vigorously not timorously, for timor no more profits a man than it does a mouse or a moth, any of the following fine and splendid formulations of art:

• chatty
• circuitous
• circumlocutory
• desultory
• diffuse
• digressive
• discursive
• evasive
• gabby
• garrulous
• long-winded
• loquacious
• maundering
• meandering
• palaverous
• prolix
• rambling
• talkative
• turgid
• vague
• verbose
• waffling
• windy
• wordy

and of course, my personal favorite word for vexing prattlers wont to sacrifice wit’s soul on the altar of florid flourish:

•  Polonian