Hypersexual behaviour is perhaps the most difficult to deal with. This is because sexuality in general is a difficult topic for society. It is important to state that not all those with FASD are hypersexual. There is extensive research into the normal brain function of sexual behaviour and the hypersexuality brain, although little about what to do about it. None of this research considers pae or fasd. We need to keep in mind that FASD does not capture all the consequences of prenatal and preconceptual alcohol, when we consider their epigenetics and immune system effects.

1. I have been asked the question - How is hypersexual behavior treated,
for FASD ?
Hypersexual behaviour is perhaps the most difficult to deal with. This is
because sexuality in general is a difficult topic for society.
It is important to state that not all those with FASD are hypersexual.
There is extensive research into the normal brain function of sexual
behaviour and the hypersexuality brain, although little about what to do
about it. None of this research considers pae or fasd. >
doi: 10.1155/2003/123757
doi: 10.1002/hbm.22262
doi: 10.1016/bs.irn.2016.04.002
doi:10.1016/j.psyneuen.2017.03.007
doi: 10.1038/npp.2012.19
doi: 10.1007/s00115-013-3858-9
doi: 10.1007/s11910-013-0386-8
doi: 10.7759/cureus.348
doi: 10.1016/B978-0-444-63247-0.00006-7
Can J Psy chi a try 2001;46:26– 34
doi: 10.3389/fpsyt.2018.00546
doi: 10.3390/jcm8020157

2. There is extensive research relating to medical conditions, other than
FASD, that are associated with hypersexuality>
Brain Inj. 1990 Apr-Jun;4(2):175-81. PMID: 2331547
doi: 10.9740/mhc.2016.09.229, 10.1136/bcr-2016-215926
There is far less research into the treatment of hypersexuality, treatment
is generally not very satisfactory and depends on the associated medical
condition >
doi: 10.1016/j.jns.2017.01.019
doi: 10.1016/j.genhosppsych.2012.03.010
J Clin Psychiatry. 1991 Feb;52(2):60-5. PMID: 1993637
As expected, there is little research into pae/fasd and hypersexuality.
This publication should be helpful >
Fetal Alcohol Spectrum Disorder (FASD) and Sexually Inappropriate
Behaviors: A Guide for Criminal Justice and Forensic Mental Health
Professionals
https://online.csp.edu/blog/forensic-scholars-today/fetal-alcohol-
spectrum-disorder-fasd-and-sexually-inappropriate-behaviors
Here is an interesting publication but, as so often, it seems to have
disappeared into obscurity >

3. Ameliorative effect of BDNF on prenatal ethanol and stress exposure-
induced behavioral disorders.
doi: 10.1016/j.neulet.2011.09.066.
Publications on behaviour intervention, although helpful, do not focus
on hypersexuality >
Alcohol Research & Health, Vol. 34, No. 1, 2011
The problem is that those interventions that are used for hypersexuality
do not take into account the cognitive, information processing and
sensory disabilities of fasd > DOI: 10.1177/107906320201400403
As always, we have to look at the correlations to make up for the lack of
research on pae and fasd. In this case the development and function of
those areas of the brain described in the above publications are impaired
as a consequence of prenatal alcohol exposure >
Magnetic resonance spectroscopy outcomes from a comprehensive
magnetic resonance study of children with fetal alcohol spectrum
disorders doi: 10.1016/j.mri.2009.01.003
Focus On: Neurotransmitter Systems. Alcohol Res Health. 2011; 34(1): 106–
120. PMCID: PMC3860557.
PMID: 23580048
So have I answered the question? Far from it.
But in all cases, the developmental disabilities of the individual with
FASD need to be taken into account in the context of the behaviour and
accusation. This requires knowledge and understanding of fasd, as it
applies to the individual, by those who judge and “treat”.

4. It is interesting to look at hypersexuality in the context of autism.
The research is more extensive. Since the brain areas involved are the
same as those for fasd it is reasonable to look at the interventions
considered for autism.
Not surprisingly, they will be familiar to fasd caregivers, except for
some of the medications that have been tried for autism.
We need to keep in mind that prenatal and preconceptual alcohol have
not been excluded in the etiology of autism.
Also, FASD does not capture all the consequences of prenatal and
preconceptual alcohol, when we consider their epigenetics and immune
system effects.
Pediatrics. 2016;137(4):e20154366
https://doi.org/10.3390/jcm8040425
doi: 10.1007/s10803-015-2622-3
Dialogues Clin Neurosci. 2017 Dec; 19(4): 381–393 PMID: 29398933
DOI: 10.1542/peds.2015-4366
DOI: 10.1159/000494761
doi: 10.1038/s41398-018-0280-x
doi: 10.3389/fnmol.2018.00107
10.1186/s13229-018-0210-z
doi: 10.1073/pnas.1801912115