A study published in 2019 that looked at various medical, traction, injection, prosthetic, and reconstructive procedures states that complications are “likely underreported.” The same study also says that the worst complications, although rare, can be “devastating.” These include penile fibrosis, sexual dysfunction, and even (in at least one case) death from pulmonary embolism. If you do decide to undergo a penis enlargement procedure, consider all the risks and follow all post-op instructions carefully.
And if you're worrying about your size pleasing your partner, remember that penetration is just one part of sex, and everyone's preferences are different. Many women don't even orgasm from penile-vaginal sex, for instance, and other people don't care very much about size or length. The size of your penis could possibly be unrelated entirely to your partner's ability to experience pleasure.
Lengthening the penis. The most common procedure is to cut the ligament that connects the penis to the pelvic bone. This allows a little more of the shaft -- on average less than an inch -- to become visible outside the body. It's not really lengthening the penis so much as revealing more of what's usually hidden. To prevent the ligament from reattaching, a guy would need weights or stretching devices daily for about six months.