Antonio Vilas-Boas was a famous Brazilian abductee. His abduction in 1957 was one of the earliest cases to draw wide-spread attention.
From the Wikipedia:
Antonio Vilas-Boas (1934-1991) was a Brazilian farmer (later a lawyer) who claimed to have been abducted by extraterrestrials in 1957. Though similar stories had circulated for years beforehand, Vilas-Boas' claims were among the first alien abduction stories to receive wide attention.(...)
At the time of his alleged abduction, Antonio Vilas-Boas was a 23-year-old Brazilian farmer who was working at night to avoid the hot temperatures of the day. On October 15, 1957, he was ploughing fields near Sao Francisco de Sales when he saw what he described as a "red star" in the night sky. According to his story, this "star" approached his position, growing in size until it became recognizable as a roughly circular or egg-shaped aerial craft, with a red light at its front and a rotating cupola on top. The craft began descending to land in the field, extending three "legs" as it did so. At that point, Boas decided to run from the scene.
According to Boas, he first attempted to leave the scene on his tractor, but when its lights and engine died after traveling only a short distance, he decided to continue on foot. However, he was seized by a 5-foot-tall (150 cm) humanoid, who was wearing grey coveralls and a helmet. Its eyes were small and blue, and instead of speech it made noises like barks or yelps. Three similar beings then joined the first in subduing Boas, and they dragged him inside their craft.
Once inside the craft, Boas said that he was stripped of his clothes and covered from head-to-toe with a strange gel. He was then led into a large semicircular room, through a doorway that had strange red symbols written over it. (Boas claimed that he was able to memorize these symbols and later reproduced them for investigators.) In this room the beings took samples of Boas' blood from his chin. After this he was then taken to a third room and left alone for around half an hour. During this time, some kind of gas was pumped into the room, which made Boas become violently ill.
Shortly after this, Boas claimed that he was joined in the room by another humanoid. This one, however, was female, very attractive, and naked. She was the same height as the other beings he had encountered, with a small, pointed chin and large, blue catlike eyes. The hair on her head was long and white (somewhat like platinum blonde) but her underarm and pubic hair were bright red. Boas said he was strongly attracted to the woman, and the two had sexual intercourse. During this act, Boas noted that the female did not kiss him but instead nipped him on the chin.
When it was all over, the female smiled at Boas, rubbing her belly and gestured upwards. Boas took this to mean that she was going to raise their child in space. The female seemed relieved that their "task" was over, and Boas himself said that he felt angered by the situation, because he felt as though he had been little more than "a good stallion" for the humanoids.
Boas said that he was then given back his clothing and taken on a tour of the ship by the humanoids. During this tour he said that he attempted to take a clock-like device as proof of his encounter, but was caught by the humanoids and prevented from doing so. He was then escorted off the ship and watched as it took off, glowing brightly. When Boas returned home, he discovered that four hours had passed.
He later became a lawyer, married and had four children. He stuck to the story of his alleged abduction for his entire life. Though some sources say he died in 1992, he died on January 17, 1991.