[MEGoody]

There is no express probibition (for gentiles, anyway) against masterbation, except to the extent its excessiveness violates the general mitzvah to “go forth and multiply” or so degrades the person to fall under sexual immorality -— a case specific judgment.

Jesus does speak of lust as a sin. I guess if you can masterbate while making out your grocery list and not engaging in fantasy, that would be okay.

[MeanWestTexan]

Jesus is an entirely different issue; purely talking Old Testament Noahide (pre-Jesus, for gentiles) issues here.