相性の良い

Aishoo no ii
(Good) compatible

I didn't know what 相性 mean and so did a search.
相性の良否 (りょうひ)
相性の良い異性 (いせい)
僕と相性の良い女性の生年月日(せいねんがっぴ)
相性の良い人を捜す。(さがす)

Looks like there are a lot of sites out there that talk about the type of people compatible to you or people looking for compatible future husband/wife. Hmm... I am more interested in this delicious site.