The pair was initially shy when they eventually met in Stuttgart, zoologist Marianne Holtkoetter told RTL.
"But then Gempa simply didn't want to leave Simpa," she said, adding that the zoo is hopeful of a positive pregnancy test.
"Orangutans are different from other apes, they are sensitive and observant of others."
Holtkoetter explained that orangutans also develop relationships with their zookeepers, and that the zoo in Stuttgart tries to give the animals the chance to choose their own partners.
Sinta and Gempa aren't the first orangutans to video date. In June a female orangutan called Conny also video-dated Tuan from Hamburg zoo, before they also recently met.
Orangutans are the only Asian species of great apes, and the world's largest tree-climbing mammal. They are an endangered species, and it is hoped that this unconventional way of meeting will help to increase their number.
Orangutans can live up to the age of 50 in the wild. They reach sexual maturity between the ages of ten and 15 years, usually give birth to a single young, or occasionally twins, and the interval between babies is between five and ten years.
These factors mean that orangutans have an extremely low reproductive rate, and their population takes a long time to recover from population declines.
According to the WWF, there are about 63,500 individual orangutans, and their population has declined by more than 50 percent over the past 60 years, as their habitat has been seriously affected by deforestation and illegal hunting.
Their natural habitat is limited to the rainforests of two islands in south-east Asia, Sumatra and Borneo. Orangutan means "person of the forest" in the Malay language.