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Message: <blockquote data-quote="Loren Pechtel" data-source="post: 953746" data-attributes="member: 4679">I have a hard time accepting that they would have been that unreliable back then.  After all, you can put water in and see if it leaks!  Besides, withdrawl is a lot more effective than that.       Besides, there's other possible techniques.  How about half a lemon used like a diaphram?       You also aren't addressing the problem that under your system condoms work a lot better for low-fertility races than high-fertility races.  If the semen is stopped, it's stopped.       Contraception should be a separate roll.After calculating the odds, I favour the latter, as it produces the following results:       Agreed.  That's a lot closer to reality, probably as good as you are going to get with a simple system.However, I am stumbling when it comes to resolving this as I am receiving conflicting arguments on conception odds and whether matters should be resolved by Climax or by encounter (been a long time since sex education...).       I would go so far as to say per day, other than in dealing with the effectiveness of contraception.  If a reasonable amount of semen is deposited that's it--conception is then entirely a matter of whether there's a good egg there.</blockquote>