We don’t suck on pipettes anymore.
In the past, scientists pipetted by mouth, inhaling and exhaling to draw and dispense the liquid within a pipette. This isn’t so safe. Plus it’s weird.
Pipette fillers & bulbs are the preferred alternative. Available in a several different styles, fillers & bulbs can be used to transfer liquids without oral involvement.
Common styles include manual pipette controllers and motorized/electronic pipette controllers.