The term can be sensitive or offensive in some cultures; use with awareness of the audience. Be careful when mentioning 'phallic' symbols in certain cultures; it might be inappropriate.
Pro Tip 2/3
Not Always Literal
'Phallic' often refers to objects that indirectly evoke images of masculinity or male sexuality. Some skyscrapers have a phallic appearance, symbolizing power and strength.
Pro Tip 3/3
Avoid Overuse
Reserve 'phallic' for clear instances where an object strongly suggests the shape or idea of a penis. Not all towers are phallic in nature; use the term judiciously.