Because they have a hard time puckering their lips the right way.
They both have a hard time pulling off a twist.
Causal fridays.
They haven't got a gig yet.
I can't hear you, but I can see your point
She only puckers up for her pacifier.
When a woman can easily move her lips after she applies it
The braille left her lips numb.
Because dogs can't whistle. (X-post from r/dadjokes)