The most satisfied were women in Colombia.
They also asked them how often women check their breasts for changes such as lumps and bumps.
Researchers surveyed more than 18, women in 40 countries in the largest ever study examining body image.
Skin erosion: In rare cases cancer that is growing under the skin can break through and create a wound.
Stock Photo - attractive fashion blonde girl portrait with big breasts
The scientists asked women questions about their satisfaction with their breasts and body generally, as well their age. They rank 9th out of the top 10, with Japan, China, and Egypt the most dissatisfied. She added: 'I was a late developer and when my breasts came they were quite big and they got in the way. Contrary to what they expected, exposure to Western media had a positive impact on body image. But a third of women said they rarely, if ever, checked their breasts for cancer, despite recommendations from the NHS.