Phallic symbols and sexual references are very prevalent in logo design. People usually regard such logos as a mistake, accident, or bad design and make fun of their "stupid" creators, but again, folks, this is all intentional and carefully premeditated.
Druker Company's logo
The inscription in Hebrew says "special treatment and education".
As you can see, this touching logo implies a quite special treatment to their students...
The flaming match can be perceived as a vagina with clitoris when turned upside-down:
Share our passion
The slogan means "insert (implant) with guarantee"
The word "virgin" has a sexual connotation by itself, but to make sure you won't miss it they also hid the word "sex" within the logo design. Click the image if you don't see it.
It's much more evident in the Chicago White Sox logo:
This one was purchased by the Office of Government Commerce, a department of Her Majesty’s Treasury in England, for 28000$
Tool's early logo
I admit that some examples here could be accidental, but could all of them be?
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