We are attracted to the opposite gender through scent. Unfortunately wearing perfume, which is very common in modern time, you may be misled. Through specific science, namely Major Histocompatibility Complex (MHC), we eliminate this.
How about the old age wisdom of not marrying someone with the same surname? Indeed there is some science behind this. Let MHC testing help locate your most compatible lifetime partner.
Compatibility = Dissimilar MHC Genes
(C = DMG)