Analyze the impact of sexually transmitted infections (STIs) on the male and female reproductive systems, considering both short-term and long-term consequences. What are the possible effects of STIs on reproductive health?
1) STIs have no impact on reproductive health.
2) STIs primarily affect the nervous system, not the reproductive system.
3) STIs may lead to infertility and increased risk of certain cancers.
4) Only females are susceptible to the effects of STIs.