noun
sexual urge; libido
A formal or clinical term for sexual drive or impulse.
性的衝動を抑えるのは難しい。
It is difficult to suppress sexual urges.
性欲 is a more common, everyday word for sexual desire, while 性的衝動 is more clinical and emphasizes the impulsive aspect.
Compound of 性的 (sexual) + 衝動 (impulse, urge).