In English, perineum is often called taint, choad, gooch and nifkin.
Pressure on the part would cause a reduction in blood flow and oxygen. You'll experience penile fibrosis, and it's ultimately hard to erect.
However, it doesn't mean you shouldn't be cycling. You should adjust your bike saddle and feel when boosting pedals. The narrower your bicycle saddle, the higher the risk of erection problems.
You may also like: