Some points to make:
- Premarital sex leads to a higher incidence of marriage breakdown.
- Most first sex experiences are not consented to fully and are later regretted.
- The dangers: STDs, emotional hurt, unplanned pregnancy, infertility, abortion.
- Bible equally condemns all sex outside marriage.
- Genetic basis for homosexuality not proven.
- Substantial evidence for behavioural aetiology.
- Homosexual acts are dangerous (Tissue damage, STDs, low life expectancy)
- Monogamous homosexuals are extremely rare.