Does the emission of semen after abstaining from sexual activity for a week or more necessitate Ghusl, or is it sufficient to change clothes or wash the soiled part?

The fluid known as madhiy is impure (najis) and nullifies ablution (wudu'). It necessitates washing the penis (and it is said: also the testicles), and it requires washing any clothing or body part that it has touched. For someone frequently afflicted by it, sprinkling water (nadh) is sufficient. All doubtful areas must be washed if the exact spot of contamination is not clear. As for maniy (semen), it is a thick, white fluid that exits in spurts, with desire, followed by a sensation of relaxation, and it has a distinct odor. It necessitates a full ritual bath (ghusl).