[swain_forkbeard]

First, what exactly is irrational about my attitude?

Second, what’s rationality have to do with it anyway?

[Theophilus]

First, what exactly is irrational about my attitude?

There is no such thing as "no-strings" sex. Sex always creates deep and reverberating consequences of which one can be cognoscente and contemplative of or not. To not care about the impact of your profound actions on yourself, your mate and your potential offspring is irrational and devoid of natural affection.