I have this problem from time to time, and the last couple of times I have been with my new fling, it has taken some time to get as hard as I would like for intercourse. The funny part is that the following morning, back with my wife, I have no issue at all! The hot dynamic, and my wife being turned on really get me going.
It's all in my head...Which gives me peace of mind in that I don't have a medical concern.
It is nice that my new lover loves to explore various positions for oral. For me it is about mental imagery and if my lover is open to variation, that seems to get me going. It is all about losing yourself in the moment. The more I think about it, the worse the problem gets...
It is nice to see a discussion around this.