Some married Sikhs think it is legitimate to use protection whilst engaging in sexual activity. Some also feel that masturbation is legitimate. They believe this because they feel they are not engaging in sex out of marriage or cheating any body. In Gursikhi sexual activity is only legitimate; if you are trying to reproduce. So condoms, the pill and other prevention methods as such as the coil are forbidden in Sikhi. Apart from reproduction any other sexual activity is seen as Lust and sexual desire; which are falsehood and filth. A Gursikh leads a pure and truthful lifestyle. Filth produces negative outcomes, for example many people who engage in lust have been hit with aids and other diseases regardless of the protection they use. A lustful life leads to many great sins (abortion).
I am called a lustful being of the dark age of kali Yuga. The five vices have corrupted my mind. Moment by moment, they lead me further away from the lord. – Ang 710 – Sri Guru Granth Sahib Ji
Even brave and might men cannot withstand the powerful and overwhelming army which the five passions have gathered. The ten organs of sensation attach even renunciates to sensory pleasures. Worshipping the perfect Guru, this awesome force is subdued. I stand before him, day and night, with my palms pressed together. – Ang 522 - Sri Guru Granth Sahib Ji
With the word of the shabad; I have killed the five thieves. - Ang 904 - Sri Guru Granth Sahib Ji
The Picture below is showing a person dying from aids in India. The Guru didn't give us a Gurmat lifestyle for no reason.