Phermones do play a role in attraction. I remember seeing a study in which women rated as better smelling the shirts that turned out to belong to good looking males, compared to women or ugly males.
Must have something to do with hormonal health and cortisol level, which must be worse in betas.
The science it's still too behind in this shit. What I'm going to attempt in the near future is the usage of Oxytocin to either make myself fall in love with someone or do the viceversa.