Tucking refers to the practice of tucking your penis and scrotum in such a way as to make them less visible. Tucking may be used by to alleviate gender dysphoria, and can be done with compression underwear (known as a 'gaff') or with tape.
We do not recommend using tape because it can cause serious skin damage.
And as always, listen to your body and stop if you experience any pain or discomfort.
Yes, tucking is generally safe. The main risk is skin irritation, so you should practice good hygiene and ensure you: