text: It is normal for a man to feel "weak" after sex because men go through a refractory period after ejaculation and orgasm, which means, he cannot climax again during that time period until refractory time is up... For a female, this period does not occur, which allows for multiple orgasms that are very hard to count at climax, but amazing. LoL. You're at the prime time for sex. It's not really avoidable...having sex so frequently won't improve it.