The best time to commit rape is when you are told you have a short time left to live because of illness, say stage 4 cancer. This is the best time because you won't do the full prison sentence when and if you get caught. This is similar to committing suicide after raping, except with suicide, you won't live your full life expectancy - your life is cut short.

Another good time to rape would be when you're old and feel like you'll die soon, but many old people make it to their 80s, 90s, 100s and even 110s and 120s. You don't know what age you might really die at. For example, you might rape at 80 years old, get caught, and die at 90, so you did 10 years of prison. Likewise, you can also prove the doctor wrong and live years after being told you only have months to live. That's why it's better to have suicide pills on hand for when you do commit rape.
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It can also be a long time to wait for youngsters to get to old age or to develop disease. By committing suicide, a youngster can rape and "get away with it" with no waiting time. I also think sperm counts go down with age, so you're more likely to get the rape victim preggers when you're young than when you're older.

It sucks to not live your life expectancy, but it's worse to live life without having touched a hole.