Avalokitesvara Bodhisattva does not need to be a male, because
Avalokitesvara is still a BODHISATTVA, not yet a Buddha (or rather,
the Avalokitesvara Bodhisattva is an ancient Buddha who decided to
become a Bodhisattva again). Avalokitesvara is currently a 10th
Bhumi Mahabodhisattva and will await the conditions for
Buddhahood.
In fact, while it is true that in terms of 32 Major Marks and 80
Minor Marks of a Buddha, a Buddha will manifest as a male, a
Mahabodhisattva like Avalokitesvara and also the Buddhas has the
ability to manifest in ANY kind of forms to save sentient beings
according to their needs - that is, whether male or female, human
or non-human, they have the ability to manifest.
See Lotus Sutra Chapter 25 (http://www.kalavinka.org/jewels/shakmuni/pumen01.htm):
.....Endless Intention
Bodhisattva addressed the Buddha, saying, "World Honored One. Why
does Observer of the World's Sounds Bodhisattva roam about in this
Sahaa World? Why does he speak Dharma for beings? And what is the
extent of the power of his skillful means?"
The Buddha declared to Endless Intention Bodhisattva, "Good Man,
If there are beings in a country who ought to gain the
crossing over to liberation assisted by the person of a buddha,
then Observer of the World's Sounds Bodhisattva manifests the body
of a buddha and speaks Dharma for their sakes. If there are those
who ought to gain the crossing over to liberation assisted by the
person of a pratyekabuddha, he then manifests the body of a
pratyekabuddha and speaks Dharma for their sakes. If there are
those who ought to gain the crossing over to liberation assisted by
the person of a Hearer, he then manifests the body of a Hearer and
speaks Dharma for their sakes.
"If there are those who ought to gain the crossing over to
liberation assisted by the person of a Brahma Heaven King, he then
manifests the body of a Brahma Heaven King and speaks Dharma for
their sakes. If there are those who ought to gain the crossing over
to liberation assisted by the person of an Indra God, he then
manifests the body of an Indra god and speaks Dharma for their
sakes. If there are those who ought to gain the crossing over to
liberation assisted by the person of an Isvara Heaven god, he then
manifests the body of an Isvara Heaven god and speaks Dharma for
their sakes. If there are those who ought to gain the crossing over
to liberation assisted by the person of a Great Isvara Heaven god,
he then manifests the body of a great Isvara Heaven god and speaks
Dharma for their sakes.
"If there are those who ought to gain the crossing over to
liberation assisted by the body of a great heavenly general, he
then manifests the person of a great heavenly general and speaks
Dharma for their sakes. If there are those who ought to gain the
crossing over to liberation assisted by the person of a
Vaishrava.na, he then manifests the body of a Vaishrava.na and
speaks Dharma for their sakes.
"If there are those who ought to gain the crossing over to
liberation assisted by the person of a lesser king, he then
manifests the body of a lesser king and speaks Dharma for their
sakes. If there are those who ought to gain liberation assisted by
the person of an elder, he then manifests the body of an elder and
speaks Dharma for their sakes. If there are those who ought to gain
the crossing over to liberation assisted by the person of a
community leader, he then manifests the body of a leader of the
community and speaks Dharma for their sakes. If there are those who
ought to gain the crossing over to liberation assisted by the
person of a government official, he then manifests the body of a
government official and speaks Dharma for their sakes. If there are
those who ought to gain the crossing over to liberation assisted by
the person of a brahman, he then manifests the body of a brahman
and speaks Dharma for their sakes. If there are those who ought to
gain the crossing over to liberation assisted by the person of a
bhikshu, bhikshuni, upaasaka or upaasikaa, he then manifests the
body of a bhikshu, bhikshuni, upaasaka or upaasikaa and speaks
Dharma for their sakes.
"If there are those who ought to gain the crossing over to
liberation assisted by the person of the wife or daughter of an
elder, community leader, government official, or brahman, he then
manifests the body of such a wife or daughter and speaks Dharma for
their sakes. If there are those who ought to gain the crossing over
to liberation through the person of a boy or a girl, he then
manifests the body of a boy or a girl and speaks Dharma for their
sakes. If there are those who ought to gain the crossing over to
liberation assisted by the presence of a heavenly dragon, a yak.sa,
a gandharva, an asura, a garu.da, a kinnara, a mahoraga, a human, a
non-human, or some other, he then manifests the form of any one of
them and speaks Dharma for their sakes. If there are those who
ought to gain the crossing over to liberation assisted by the
person of a vajra-holding spirit, he then manifests the body of a
vajra-holding spirit and speaks Dharma for their sakes.
"Endless Intention. This
Observer of the World's Sounds Bodhisattva has perfected
meritorious qualities such as these whereby he employs all
different sorts of forms and wanders to every region crossing
beings over to liberation. Therefore, you should
all single-mindedly make offerings to Observer of the World's
Sounds Bodhisattva. In the midst of fear and urgent difficulty,
this Observer of the World's Sounds Bodhisattva, Mahasattva is able
to bestow fearlessness. Hence everyone in this Sahaa World calls
him 'The Bestower of Fearlessness.'...