So since you can't expect it of MTL.... on the difficulty selection screen you have 'baby' 'ordinary man' and 'yaritin'. 'Yaritin' = 'Yari-chin' = 'yari-chinpo', which means his dick is always ready to go aka male whore. You see it a bunch in AV. It's the male version of 'yari-man' = 'yari-manko' = pussy is always ready aka slut.
By the way, bad TL always mis-translates 'yari' as 'spear', so if you're looking through JAV titles you'll see a lot of 'spear' that makes no sense.