The best replacement for xx is xy.

The best alternatives to xx are rated as following:
★★★★★  xy
★★  xy chromosome
★★  xo
★  xx1
★  xtr
★  shimano xtr
★  x0
★  eneloop
  yx

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Speaking about xx, one probably shouldn't forget about notorious.

Other search terms related to xx and their ratings are:
★★★★★ notorious
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xx
xy
xy chromosome