The best replacement for fwb is nsa.

The best alternatives to fwb are rated as following:
★★★★★  nsa
★★★★  dating
★★★  fb
★★  girlfriend
★★  ltr
★★  affair
★★  choctaw
★  open relationship
★  lovers
★  lover
★  gf
  casual dating

Your alternative for fwb is not listed? Suggest!
Speaking about fwb, one probably shouldn't forget about nsa.

Other search terms related to fwb and their ratings are:
★★★★★ nsa
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Google Trends

Scale is based on the average worldwide traffic of fwb in all years. Click on graph for more.
fwb
nsa
dating