From the ACLU Handbook: _The Rights of Authors, Artists, and Other
Creative People_, 2nd Ed., by Kenneth P. Norwick and Jerry Simon
Chasen, 1992:

"Although the Supreme Court has not yet directly considered the issue
[of minor access laws], three 'display' or 'access' statutes have been
struck down as unconstitutional by lower courts.[121] A Georgia display law
was invalidated because it prevented the perusal by and limited the
sale of constitutionally protected material to adults.[122] Protecting
minors was held to be an inadequate justification for such a severe
interference with adults' First Amendment rights.

A Colorado display statute was invalidated because the court concluded
that channels for the interchange of literary, political, artistic,
and scientific ideas about sex were effectively closed by the statute
and that its enforcement would regulate to a commercially infeasible
degree the activities of responsible members of the community.[123]

Likewise, a California court invalidated a display ordinance which
required that commercial establishments seal magazines or books
containing sexually explicit but non-obscene picture, keep them out of
the reach of minors, or else bar minors from entering the stores.[124]
The ordinance would have affected display in drugstores, grocery
stores, and newsstands in addition to adult bookstores. The court held
that the sealing requirement infringed the freedom of adults to browse
and that the entire impact of the statute denied children access to
material which they had 'an unfettered constitutional right to
enjoy'.[125] 'Whether accompanied by parents or not,' state the court,
minors 'cannot be denied access to retail establishments which sell a
wide variety of literature, or the necessities of life, simply because
such establishments also sell some materials sought to be
restricted.'[126 ]
[...]

[121] _American Booksellers Association v. McAuliffe_, 7 Med. L.
Rptr. 2288 (N.D. Ga. 1981); _American Booksellers v. Superior Court,
supra_ note 119; _Tattered Cover, Inc v. Tooley_, Case No. 81 CV 9693
(Dist. Ct. Denver Co.) (unreported decision of Jan. 7, 1982)

[122] _American Booksellers Assocation v. McAuliffe, supra_ note 119.

[123] _Tattered Cover, Inc. v. Tooley, supra_ note 121.

[124] _American Booksellers Association v. Superior Court, supra_  note 119.

[125] _Id._ at 2017-18.

[126] _Id. 2017.