best way to describe an orgasm

[Bob L]

I recently was chatting with a younger "virgin" relative and was asking about what an orgasm feels like for a guy.The best way I could describe it was -at least for a guy -was imagining you had to take a leak the baddest you've ever had to go- and when you finally go the relief you feel is similar.Anyone have a better description?And for that matter Id be interested in hearing descriptions about womens orgasms comparisons.