The best replacement for cleavage is fracture.

The best alternatives to cleavage are rated as following:
★★★★★  fracture
★★  crystal form
★★  segmentation
★  bum
★  decolletage
  heterolytic
  determinate

Your alternative for cleavage is not listed? Suggest!
Speaking about cleavage, one probably shouldn't forget about breast forms.

Other search terms related to cleavage and their ratings are:
★★★★★ breast forms
You have in mind a companion for cleavage and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cleavage in all years. Click on graph for more.
cleavage
fracture
crystal form