.
Updated links, to MARVEL FANFARE 43, that I posted a while back above :
https://readallcomics.com/marvel-fanfare-1982-043/ And the less impressive earlier story from in MARVEL FANFARE 16, also by Mantlo and a still budding Mike Mignola :
https://readallcomics.com/marvel-fanfare-1982-016/ And new links also to the above series:
The Byrne story mentioned before, where Sub-Mariner flirts with Sue Richards, in a crossover story, is in ALPHA FLIGHT 3 (Oct 1983).
Then FANTASTIC FOUR 260, and concluded in ALPHA FLIGHT 4 (both cover-dated Nov 1983), in a period where Byrne was still doing good work.
It's up to the reader to interpret how much cuckolding might have occurred off-screen in these issues.
https://readallcomics.com/fantastic-four-v1-260/
https://readallcomics.com/alpha-flight-v1-004/ And the early Sub-Mariner appearances in the Lee and Kirby FF run, in FANTASTIC FOUR issues 4, 6, 9, 14, 27, 33, and ANNUAL 1 :
https://readallcomics.com/fantastic-four-v1-004/
https://readallcomics.com/fantastic-four-v1-006/
https://readallcomics.com/fantastic-four-v1-009/
https://readallcomics.com/fantastic-four-v1-014/
https://readallcomics.com/fantastic-four-v1-027/
https://readallcomics.com/fantastic-four-v1-033/
https://readallcomics.com/fantastic-four-v1-annual-001/ Then given his own Sub-Mariner series in
TALES TO ASTONISH 70-101 :
https://readallcomics.com/tales-to-astonish-v1-070/ And then beginning after that in 1968, his own
SUB-MARINER series for another 72 issues :
https://readallcomics.com/sub-mariner-v1-001/ Plus in the series I think Namor worked the best, in 152 issues of
DEFENDERS :
https://readallcomics.com/defenders-v1-001/ And IRON MAN 120 and 121, by Michelinie and Romita Jr /Layton :
https://readallcomics.com/iron-man-v1-120/
https://readallcomics.com/iron-man-v1-121/ 
