Gerard Butler Honk, Honk

0822_gerard_butler_boobs_butt_grab_beach_photos_launchDr. Gerard Butler displayed his vast knowledge of the female anatomy ... by administering a mammogram in a public parking lot.

Butler was in Malibu this week with an unidentified smoke show when he started exploring inside her bikini balloons -- following up with a tush grab.

Take one of these ... and don't call me in the morning.