Don't put foam in there...
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https://gizmodo.com/mans-penis-fills-with-foam-after-diy-erectile-dysfuncti-1848376444
The unfortunate tale was published in the November issue of Urology Case Reports, though it only seems to have garnered media attention this week. According to the report, the 45-year-old man had been inserting various objects into his urethra for some time as an aid for erectile dysfunction. During one such occasion, he and his partner had decided to use a straw attached to a can of weatherproofing spray, when the partner “inadvertently pressed the button deploying the foam.” The foam then shot through his entire urethra, even filling up his bladder. The man waited three weeks before seeking medical attention at an emergency room, during which time he increasingly had difficulty urinating and urinating blood when he did.
Inserting objects into the penis can lead to something called urethral stricture disease, or scarring that narrows the already tight passageway of the urethra. In this man’s case, his narrowed urethra apparently anchored the spray foam in place along his penis. And while doctors were able to remove the foam from his bladder with relative ease, his condition meant that they couldn’t fish out the rest from his penis with minimal endoscopic surgery. Instead, they had to cut him open through his perineum (the skin between the penis and anus, also known as the taint).