Red Panic!! -The Guy Who Needs to Get off 8 Times a Day-

From Renta!:

Apparently, if you touch yourself too much, some red stuff will come out, and you die...!! ...Or, that's the urban legend Yu believes (no wonder he gets the worst grades in his class), and Masumi wants nothing more than to help him!! So, what does he start doing to Yu...!? This manga brings you boys with their hormones raging, a patissier, an older laborer, and so much more!!