Some points on disadvantages of sexual reproduction are:
1. It relies on two individuals being available at the same time and lowers how fast populations can grow.
2. It forces organisms to spend more energy preparing for mating and cuts the reserves they need for protection.
3. It extends the time needed for each reproductive event and cuts the number of offspring that appear each generation.
4. It needs partners to cooperate during mating and raises the chances that fertilization does not succeed.
5. It pushes organisms to travel across exposed spaces to find partners and heightens the risk of being caught by predators.
You might also like comprehensive advantages and disadvantages of sexual reproduction.