I list myself as 99% straight and that is because I find this site curiously interesting. I have no interest in any type of physical male contact.
I have never tried anything with another male only because I find the idea repulsive. I have incredibly close male friends but it is very different than my relationship with my wife. I have been through experiences with male friends that I wouldn't have wanted to go through with my wife and the same for the opposite. I feel that there is a codependancy between a man and a woman that can't be met by myself having any kind of relationship with another man. The whole idea just seems so naturally wrong to me. My wife has a strong personality and is also physically strong but at the same time her female side wants a man that will provide and protect her.
The closest I have ever come to physical contact with another male was with my doctor. I found nothing enjoyable about having his finger up my ass.
As far as alpha males, I have to agree with OC and some others. There are gay alphas out there. It is common to see "gay" acts in other animals such as dogs and bulls. The dominant animal will often use the aggressive sexual behavior to control the weaker animal. Being an alpha doesn't make you straight.
I would define myself as an alpha based on a couple of things; I am bigger than average, I am more aggressive than average, I am very confident and I am very determined. I can walk into a group of people and quickly take leadership. I don't need other's approval or acceptance.
I have been told by many that I am intimidating in all kinds of situations. I don't purposefully try, it is just my natural characteristics. I usually go into a competitive mode when I am around friends. To me, guy-guy contact would be a slugfest to see who is the best. The "do what feels right" philosophy is what I believe but man to woman is all that feels right.
I am not the biggest but to many I am a gym rat. I have no problem with nakedness in the locker room or around other males. Just don't touch.
I have no problem looking at a man and saying, "that is one hell of a body" out of respect for what they have done. I have no problem looking at a man and saying, "that dude has the looks". That doesn't mean that I am interested in having any kind of relationship with them. I can appreciate their appearance without having a desire to go any further. If I set back and think of the most attractive male in the world and then picture myself doing anything sexual with that person, I go blank. It just isn't there, no interest, nothing happens.