Could have been the odor...or nervousness.
I do not doubt that two straight men could arouse and satisfy each other physically. The physical response to physical stimulation is likely involuntary to a great extent.
If one defines dating as planning and participating in a mutual experience, I've already dated straight men. I used to go hunting/fishing with one straight guy, I used to play tennis with another, I go to a strip club often with another, and to car races with yet another, I have dinner often with another man...but none of us ever got turned on to each other.
If one defines dating as "trying to get some", then I doubt I will ever date a man, straight or gay.
I stated that the claim that all gays were born gay is BS, not that none were born gay.