Howard was big on cigars, and I think Bill Clinton could relate about that.
I'm not sure I am "shipping" on any "couple" right now in GOTG. Moondragon has been written as a lesbian since the 90's but she did pine for some male characters earlier, so she may be considered "bi-curious" if not bisexual. Before bedding Nova, Gamora hung around Adam Warlock for ages in his Infinity Watch group so it made sense that she freaked out after Phyla "stabbed" him, and would be the most afraid of Magus, since she already lived through a few Magus stories.
Mantis once married a plant clone of Swordsman, of all people, so she apparently likes Europeans with facial hair. I think Kang used to chase her for a while when she was "the Celestial Madonna" and hey, he'll be popping up soon. Still, chasing her through time and space just to sire a universal messiah figure is basically like being a Time Traveling Attempted Rapist, so who knows.
Peter Quill is a good "John Crichton" style leader (even if he technically isn't exactly human, even if he looks human) so it seems strange he hasn't had a romantic subplot yet. As for Bug, who knows. Jack Flag probably deserves some love as well; personally I find it amazing and incredible, in good ways, that an F-Lister like him that Warren Ellis had mutilated in THUNDERBOLTS for a shock value moment has been saved from such obscurity and now is doing some great things in a new venue. It's totally unexpected - a CAPTAIN AMERICA wanna-be and hanger on from the 90's suddenly becoming a regular cast member on a space adventurer team - but it has worked out well so far.