The best replacement for affection is attraction.

The best alternatives to affection are rated as following:
★★★★★  attraction
★★★★★  affection
★★★★  effection
★★★★  attention
★★★★  intimacy
★★  affectation
★  happiness pokemon
★  dominance
  criminal conversation
  no affection

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Speaking about affection, one probably shouldn't forget about ashara zavros.

Other search terms related to affection and their ratings are:
★★★★★ ashara zavros
★★★ khem val
★ companions swtor
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Google Trends

Scale is based on the average worldwide traffic of affection in all years. Click on graph for more.
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attraction
affection