When it comes to sexual satisfaction, penis size doesn't matter, but technique does. / (more generally) The tools you use to accomplish a goal are not as important as what you do with them.

(often ironic, sarcastic) Don't blame yourself for the end of our relationship.

An action or occurrence must be very bad indeed if it brings no benefit to anyone.

Boasting and loud talk should not be mistaken for the work that produces real achievements; bravado is no proof of action.

(informal) One's decisions or actions will bring undesirable consequences only on oneself.

Alternative form of strike while the iron is hot

In order to save water, only flush the toilet after defecation, not after urination.

In order to save water, do not flush the toilet every time you urinate.

(informal) Used to indicate that a person, thing, or situation possesses a described characteristic to an extreme or unusual degree.

Expressing pleasure that the workweek has ended and the weekend has come.