Motorcycles are very common for men, especially in our economy today with gas prices being so high. However, the money you save on transportation you may need to spend on a men fertility supplement if the vibrations and such get to you. Yet they tend to have a seating area that is pressing up against the crotch area. Even bicycles commonly do so. You want to avoid this as it can create problems for you when you want to have a child. Keep in mind that even the activity of riding a horse on a regular basis can prevent you from having a child.