I am going to post a couple stories for you all of my experiences with straight guys. Some are married, some were married, all were curious, some found out that they don't like man on man play, some came back to further their experimentation, and some did everything at once.
So lets start with the last one. He is 26, married about a 2 years, no children and doesn't want any. Very well educated and intelligent. Good looking, clean, and was curious. He posted an ad, I replied, and he stopped over. He told me that his wife does not suck and he hasn't gotten head in quite awhile. He was/is open to other play but wants to take it slow and move as he is comfortable.
The attached pictures are of his very nice cock. I had the privilege of being the first man to have touched it, played with it, and suck it for him. He dropped his pants and it didn't take long for him to get hard with no stimulation at all, he didn't touch it and I didn't touch it and he was growing. A very nice cock about 7 inches and very nice thickness. It didn't take him long to shoot a load down my throat and after my mouth got on his cock there was the very noticable moaning and oh yeahs coming from him.