Aggressor as applied in Socionics is a dubious term. The animalistic prime directive of most normal, heterosexual males is to impregnate females in a possessive, controlling/manipulative fashion. Type may, to a limited extent, determine how this urge is likely masked and visible aggressiveness indicates less capability to mask true intentions, which isn't limited to specific types. Now attractive men usually have bigger herds from which to choose but those aggressive urges are still ever present; if they aren't then males should have their testosterone levels checked. Being socially inept is a much broader problem that could also lead to them not chasing women; one should not confuse clumsiness with aggression. Most normal, heterosexual females are sexually 'thirsty' but cognition, in a similar fashion, masks their urges too.

a.k.a. I/O