Tucking
Category: Trans Health & Gender-Affirming Care
Tucking gives a visibly smooth crotch contour. The testicles, if present, are moved up into the inguinal canal, and the penis and scrotum are drawn back into the perineal region. Tight-fitting underwear or a purpose-made undergarment called a gaff then holds that position; some people use adhesive or tape instead.
The UCSF guidelines note the trade-offs plainly: alongside effects on the skin itself, tucking can lead to urinary irritation or infection, and to testicular discomfort. Tape and adhesives are the harshest on skin.
None of that makes tucking unsafe as such — it is ordinary practice for a great many trans women and transfeminine people, and it is worth knowing that a gaff exists rather than improvising with tape.