Scientists have found microplastics in human penises for the first time, as concerns over the tiny particles’ proliferation and potential health effects mount.

Seven different kinds of microplastics were found in four out of five samples of penis tissue taken from five different men as part of a study published in IJIR: Your Sexual Medicine Journal on Wednesday.

Ramasamy said he wasn’t surprised to find microplastics in the penis, as it is a “very vascular organ,” like the heart.

The samples were taken from study participants who had been diagnosed with erectile dysfunction (ED) and were in the hospital to undergo surgery for penile implants to treat the condition at the University of Miami between August and September 2023.

Now their presence has been confirmed, more research is needed to investigate potential links to conditions such as ED, Ramasamy said.