There are many ways to restrain an untamed cock. Tape is the most benign i have encountered, a cage is a most humane way of sedation, straps such as the ones on these panties are an excellent way of controlling a cock.
The cruel part of tape is that growth is impossible and discomfort is constant. A cage offers mobility and so is restrictive only in one direction, free and comfortable in the other.
Straps are unpredictable, with movement it is a constant shift, growth is constant in all directions and there are varying degrees of comfort.
Unpredictability is such a sweet gift, wearing these panties for Mistress means a most exciting and thrilling day