All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
The person whom you referred to in the question is considered a homosexual, he is disobedient to his Lord and sinful, and he is obliged to repent to Allaah. The term homosexual applies to that man because he is sexually perverted and through his abominable act he has contradicted religion and the Fitrah (natural disposition upon which Allaah created mankind), and he has also contradicted the sound and sane people. Therefore, he is obliged to repent to Allaah before he regrets when regrets are of no avail. You should advise him and remind him of Allaah and His severe Punishment.
For more benefit, please refer to Fataawa 84094 and 89844.
Allaah Knows best.