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What do you call a guy who is dating many girls at the same time?

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  1. a Don Juan; a ladies' man, a successful seducer of women, an obsessive and unscrupulous pursuer of women. From the legendary nobleman who seduced hundreds of women and was eventually damned for his immoral ways.

  2. a womanizer; a promiscuous heterosexual man

  3. a philanderer; a man who readily or frequently enters into casual sexual relationships with women.

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Another good option is Lothario: a man whose chief interest is seducing women.

The similar, more modern (slangy) term is player.

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