autosatisfacerse

Can mean simply to satisfy one's own needs or desires (autosatisfacerse profesionalmente), but is also a common euphemism for masturbation — context determines which sense is meant.

• Buscaba una carrera que le permitiera autosatisfacerse profesionalmente. — She was looking for a career that would let her fulfill herself professionally.
• Es difícil autosatisfacerse por completo sin el reconocimiento de los demás. — It's hard to fully satisfy yourself without recognition from others.
• En textos médicos, autosatisfacerse se usa como eufemismo para la masturbación. — In medical texts, autosatisfacerse is used as a euphemism for masturbation.

Because of its double meaning, using it in a professional or personal-fulfillment sense without enough surrounding context can sound unintentionally suggestive — masturbarse is the direct, unambiguous term when that specific meaning is intended.