breast or pussy, those dont much matter to get orgasm.
to me ( i guess most grils are similar with me ), more important thing is.. how partner can lead mood and situation in sexually.
if u lead ur girl friend or partner well, she can be concentrated sex and situations.
how u can good stimuate her fantasy and inside.. it is best way to lead girl's orgasm.
forget physical skills (if u are average healthy and general male), and study "fantasies and girl's mentality
sorry.. im sure my english is hard to understand.
i hope u can catch my point.
mood (not only romantic), leading fantasy and situations.