The phrase "suggestive references" means when something indirectly hints or alludes to something else. It implies that there is a subtle connection or suggestion being made, without explicitly stating it. Full definition
«Grown Ups,» a Columbia Pictures release, is rated PG - 13 for crude material including suggestive references, language and some male rear nudity. (csmonitor.com)
Other sexually suggestive references are made about an adulterous couple. (parentpreviews.com)
MPAA Rating: (for crude material including suggestive references, language and some male rear nudity) (markreviewsmovies.com)