Bob has few pleasures in life, as can be witnessed by his bad childhood, the death of his mother and strained relationship with his father, his lack of close friends and the fact that he seems to either not have time for hobbies or to have them conflict with other priorities, like in Weekend At Mort’s when we learn he loves to build models or the gardening episode.

While admittedly comfortable in his own skin, he knows he is overweight, balding and that he has a lot of excess body hair because his children take pleasure in reminding him. But, he takes life pretty much at face value. He works the restaurant and…that’s about it, but he is fine with that. He loves his kids, he loves his work, and that is enough for him.

I say that because I don’t think being bisexual is something Bob as a character would have the presence of mind to realize about himself or, if he did acknowledge it, he would calmly accept it and move on with his life, as it is too late to do anything about it, anyway. He’s married and he has three kids. End of story.

But, there is a lot of evidence throughout the show to demonstrate that Linda isn’t exactly the love of his life and that he is not enthusiastic about any aspect of their relationship, including sex. He is, at best, ambivalent to all women, except Marshmellow, but I will get to that. Bob needs Linda as a co-worker, that is thoroughly established when she goes to work at the grocery store, but as a wife…not so much. He never remembers to do anything remotely special on Valentines day for her or any other holiday, like her birthday, and the one time he goes all out for a romantic gesture – its not even Linda he was thinking about! And, on the Linda’s birthday episode, Bob had been so oblivious to her day-to-day life that he discovers all of this new stuff about her…because he never asks where she is or what she is doing because he doesn’t really care. When they try to go out on a date or relive the day they met, we find out that there isn’t a lot of romance keeping them together, even from the beginning. Linda is the kind of oblivious, delusionally optimistic and silly kind of character that she would fall in love with a mustache. But, we never hear why Bob felt the same, exactly. Linda is always the one to initiate sex, as well, always reminding Bob when they have opportunities alone to be intimate.

Only when faced with the eminant chance that another man might make a move on Linda in the Flying Lessons episode does Bob get remotely jealous. Teddy’s awkward advances on Linda don’t phase him, though.

When Bob drives a taxi to help save more money for Tina’s birthday, he meets three trans women and helps them to meet johns. He hits it off with them so well that he invites them to his child’s birthday party. This is his introduction to Marshmallow, the confident, boldly dressed trans woman who makes sporadic appearances throughout the show. Of anyone in the entire cast of characters, Bob pauses for an odd soliloquy to honor his friend Marshmallow, “she comes and goes as she pleases, she answers to no-one and she is truly free.” The far off look in his eye as he says this reveals an admiration for her. She lives the complete opposite of Bob: she is free of family, free of marriage, free to explore sexually, free to travel, etc.

In the Thanksgiving episode where Bob is sleepwalking, he begins to have a rapport with the deli worker at his local grocer. After the deli worker insists Bob is visiting the store just to see him and flirting with him, he finally tells Bob he has left his boyfriend. The deli worker begs Bob to go away with him and, surprisingly, Bob agrees! He even tells the man that he is “mostly” straight. I believe Bob is genuinely tempted by this offer in the heat of the moment because not only is he flattered and this would be a chance to escape his responsibilities, which is tempting, but because he is also bi and never got a chance to explore that part of his sexuality. I don’t believe that this was a ruse to have the deli worker believe he was a good cook and not the kind that could ruin four turkeys. He gets nervous, he hesitates, he is tempted and he even has to tear himself away from the situation yelling, “I’ll call you!” before it goes too far.

Also, when the whole family is kidnapped on the cruise, Bob offers to make out with that gross Chef and even do “other things.” This was under duress, but still.

And, early on, we have the incredibly awkward infatuation Bob experiences with that cow from the documentary. It is a steer, a male, with a wig and he gets pretty hot and heavy with Moo-Lissa in a dream, which leads to him feeling a bond with the animal that drives him to keep it safe in their apartment. When Linda does something similar with a racoon, Bob is not so open to the idea, probably since he didn’t have a sex dream about Little King Trash Mouth.

Then there was that time Bob was willing to wrestle his true arch nemesis while both of them were completely nude. Surrounded by naked onlookers. At a nude beach.

It is worth mentioning that Bob generally doesn’t like to do crazy, silly shit. He is always in the background watching in horror at his family’s antics, saying “Oh my god” or just “Lin…” He won’t take flying lessons, he won’t do a tiki theme, he hates the modern art piece bathroom, etc. When will he step out of his boundaries? For his kids, obviously, but also for these subconcious chances to express his bisexuality.

Ultimately, though, it is most important to note (and a reason I love this show), that Bob doesn’t consider his sexuality at all. It’s just another part of his personality and one that he did not get to entirely explore before he married and had kids, so he knows that that ship has sailed.

TL;DR Bob admires Marshmellow, fell in love with a steer, almost ran away with a gay deli worker and wrestled a guy naked, but loves his kids and acts responsibly.