Special tricks
For the exercises such as jelqing that require you to stay partially erect, I do this:
Personally, I perfer not to think or visualize- I just do it. So to help stay partially erect, I simply set my nudie pictures into a slideshow and let the slideshow play while I go to work.
Granted, unless you’ve just started, you probably have a technique for this already, but I thought I should contribute something for my first post.