I stumbled across this old thread and thought I would chime in.
I have wondered the same thing as the OP for some time and have enjoyed reading this thread. While I don't think that men drive women into bisexuality or think women are so desparate for attention and foreplay that they turn to each other for comfort I will add a couple observations I have had.
#1. I have seen quite a few women that claim to be very bi but when they are "engaged" by a man that is attractive and attentive, they don't show any interest in other women at all. I am a bit of a forum junkie and I have seen other bi women ripping on gals like this in the forums saying they are fakes and "pretend bi" or "bi untill a guy" etc etc. I guess you only win the acceptance of the Bi-Sisterhood when you only play with the girls.
#2. One thing that makes me wonder if arvcpl has a point is that I have seen a lot of guys at the clubs that I would describe as being almost downright sexually inert. You know they probably dragged their wife to their first party because they had visions of threeways with Jenna Jamison dancing in their heads but now they sit in the back of club and don't approach women, don't flirt, don't dance and when approached by a woman just kind of smile and answer a few direct questions with as few words as possible and just stand there. I know a lot of people have varying degrees of shyness and I am not an aggressive person myself but c'mon.
#3. Somewhat related to #2 I have also seen a number of guys that sit at the table and send their wives out to bring back women like their own little huntress. If this works for them in the end fine, but it seems to me if it is the female half that has to do all the talking, flirting, dancing and schmoozing it also stands to reason that in the end if the clothes come off it is going to be the women that are mashing flesh and the guy is going to end up doing what he did all evening and that is pretty much just sitting there
.
IMHO having a huntress is just laziness and lack of initiative and in the end you get what you pay for.
#4. I have run into a number of couples that really don't even allow each other to play with members of the opposite sex. They are both ok with her doining some stuff with other women but they get real squeemish at the thought of the other doing anything with the opposite sex. Since guys aren't going to mess with other guys then while the girls are out dancing and feeling each other up the guys are in the back talking sports and monster trucks.
#5. I have run into a number of newbie couples at their first club party who came in search of a single Jenna Jamison look alike who would join them for an FMF. They each had a huge fantasy of FMF and came to the club to find a unicorn and had such a specific scenario laid out in their heads that they had no interest or intentions of befriending any couples (other than to have them point out where all the single Fs where....you think I am joking but I'm not). When they realized that there truly were only 2 single Fs in the building and one was 300lbs and the other was 55 years old but looked 68 they were out of there and I haven't seen them back.
#6. There are truly only men who only want to see their wife roll around with other women and they themselves have no interest in being with another woman. At first when I came across guys like this I thought they were just saying they don't have interest in other women to keep their own wife happy but in getting to know them a little discover they are sincere and truly don't have an interest. they are just so hung up on seeing their wife with other women that is all that the couple pursues even if the wife herself is 99% straight. These couples scare me because one or both of them have such a specific fantasy that they are pushing themselves and each other into things that are probably an unnatural state for each of them.
Those are just a few of the thoughts I had at 8 in the morning, I'm sure I'll come up with something else before too long.