Yes, you do need to spray

on a cologne if you are using an unscented phermone, especially one that contains -none. If not you will stink like

a pig! Its not a big concern about mones first or cologne first. However, Perception is the exception to this

rule, as its water based. If it is used with an "external" fragrance then dont put those on the same app spot, or

apply fragrance first then Perception mones.

Some products are scented but not scented enough, like scented

TE and Primal. They dont stink as bad, but will soon start stinking again if you dont have a cover scent.