Sikhism is a monotheistic religion that was founded by Guru Nanak in fifteenth century India. there are 23 million Sikhs in the world The principal belief of Sikhism is faith in one God and advocates the pursuit of salvation through disciplined, personal meditation on the name and message of God. Sikhs follow the teachings of the ten Sikh gurus, or enlightened leaders, as well as the holy scripture entitled the Gurū Granth Sāhib, which includes selected works of many devotees from diverse socio-economic and religious backgrounds. The text was decreed by Gobind Singh, the tenth guru, as the final guru of the Khalsa Panth.
Wikipedia covers this subject reasonably well: LGBT_topics_and_Sikhism
SARBAT - A group for lesbian, gay, bisexual and transgendered Sikhs.
Sikihism and Sexuality - A leaflet from a Sikh educational site mentioning homosexuality.