Anastasia Tutik, a 19-year-old Russian and a Mexican, known as Miguel, 18, were in a clinch when they lost their balance.
They died instantly when they dropped from more than 60ft from the sixth floor.
They were actually celebrating at a luxury apartment block in Deptford, South-east London, with her fellow students from Bellerbys College, an international school which charges fees of up to £21,000 a season.
Witnesses said they heard a huge bang in the early hours. Samson Oguntayo, 32, who is a neighbour, said:
“They were trying to have sex on the balcony. The guy was lifting the girl and putting her on the bannister, he kept on doing it.”