What this is meaning Summer is that sperm need to not be "stored". Sperm are fragile and can be damaged. If the sperm is released and then new sperm are at the ready it makes pregnancy more likely. Many people go for it like rabbits at ovulation time and then don't have sex very often until ovulation again. The idea is to aim for intercourse about 3 times a week throughout your cycle and then daily providing there are no sperm count issuesat your fertile time.