Look, and I am dead serious here.  This women talking trash about men is the least of your worries. 

Here are some things you must do:

  1. You must never, ever get romantically involved with a coworker. Ever. 
  2. You must get an employment lawyer on retainer that specializes is human relation problems and sexual harassment. Tell them that you are the only male at work and if you have any problems or even suspect some is going on call them right away.  Trust me you'll be glad you did.  
  3. At an after work happy hour do not consume any more than two drinks and leave.  
  4. Make sure you are never alone with any of your coworkers at any time.  
  5. Purchase a personal recording device and use it.  I don't care if you don't live in a single party state do it!  
  6. If you are ever sexually harassed or have any kind of foul or abusive language directed at you call human relations/resources and your lawyer emidiately.  Again document everything.  
  7. Do not under any circumstances talk about your sex life or intimate personal relations.
  8. Do not ever, EVER, give them any access to your wife, girlfriend or mother's contact information. Tell all of the women in your personal life that they are in no way free to start friendships with your coworkers.  Trust me, this is where things can get really out of hand.  Establish and reinforce basic interpersonal boundaries at every turn because if you are the only male there they will be sure to target you collectively because that's what groups of women do to individual men.  They test boundaries and that's all there is to it. 

Trust me brother I have lived through it and know many others who have.  As a lone male coworker you are extremely vulnerable to bad female actors in a way that lone female workers are not.  Not by a longshot.