I wanted to, but there were two problems:

1. In order to provide appropriate granularity and with the polling available from the forum, I'd need sixty options - 30 for length and 30 for circumference. A list that long would be confusing and the data hard to export.

2. There would be significant skew caused by males voting up their own particular size in the vain hope that actual women would look at the results and think 'Well I never, 3 and a half by three inches is favoured by the majority of women? What am I missing out on? Hmmmm. Perhaps I should try one".