If young, you don't have to do anything. Young men can get hard many times a day, where ever they are, not just when they are about to have sex. This is because the mind is connected bodily to ones reactions in sex. Plus they have a very active libido when young. So just seeing a pretty girl fully clothed is enough. Don't worry, you don't have to do a thing.
If we are talking an older male, there can be several medical reasons why he is having difficulty so its best he have a check up to rule out something like prostrate cancer. If he is taking medications for heart or other conditions that too can affect it. If he is reasonably healthy, extra exercise, aerobic for heart included, could condition his body to be able to generate more blood flow. If there is no physical reason why he shouldn't be able to get erect easily or he does but it takes lots longer, you can first of all have patience and not make him feel bad about it. Having too much worry about it will make him shut down even harder. A caring woman who truly loves her man no matter the difficulty will continue to love him, kissing him passionately which is one thing that will make a man grow hard quick because he feels how much he is still wanted and desired. Holding and playing with, sucking on the flaccid penis and playing with the balls will also make him hard after a while. Once hard, he should be able to remain so long enough for you both to enjoy climax as long as he is feeling a good amount of stinulation. If you haven't learned yet how to squeeze your vaginal muscles, do those kegel exercises. Also imagine in your mind your vaginal muscles squeezing his cock inside you. That is a great way to excite men, keep them hard and get them to cum. Hope this helps no matter which situation was yours. [ Dragonflymagic's advice column | Ask Dragonflymagic A Question ]
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