Ultimately, it is up to your friends to decide whether they want to go to an ex-gay ministries or not, but to help them to decide, I thought of some tips:
1. Try and introduce them to get in touch with gay people, and the community, it would show them what it is like to be in the gay community and what it means to be gay
2. Get them to talk to people who been to ex-gay ministries, so they would know who its feel like after being in a ex-gay ministries, and what its feel like to be in it
3. Encourage them to pray to God, not for change in sexuality, but for re-assurance of their own sexualities and confidence.
Also, Tyra’s talk shows about Gay people hating themselves being gay, it is a good insight on how to deal with one’s own sexuality: