Sun Ken Rock (drawn by the same artist) also has its fair share of male fanservice, though not as much as on the female end if youw ant to check it out.

It stops juuuust shy of being porn on either side.

Bonus for the main character looking like Senkuu if he got jacked and became a delinquent instead of a scientist.

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Warning: It is a seinen, and takes full advantage of the loosened restrictions on what themes and acts can be explored in detail (for better or worse is up to interpretation), and it deals a lot with mafia.