An extreme desire towards lingerie and particular clothing is okay and seems fine, similarly fantasies such as being lifted and dominated by the counter sex stronger and bigger than you (Macrophilia).These ( and many more ) fit well in personal preferences but some are just exceptional cases like the most listed above, Eg. Sexually aroused by seeing another person being hurt and inflicted with pain ? Thats just not right or normal which indicates a definite problem/disorder.
Some cases:-
https://ca.answers.yahoo.com/question/i ... 341AAyS0HChttps://ca.answers.yahoo.com/question/i ... 256AA9WUC2https://ca.answers.yahoo.com/question/i ... 628AApHeWjMost probably the person may have went through a severe psychological trauma in their past, most probably their childhood, which could have effected their psyche.
This explains for the extremely odd behaviour presented by the afflicted person. I would say that the person act out of their severe past trauma which the brain had coped with. The term "dissociation" fits well into the context. Dissociation is the ability of the mind to hide a memory, a feeling, or a body sensation for a short or a long time.The mind does this quickly when it feels that what is happening is too much for us to handle. The mind acts like a light switch and turns off all or parts of the event. It also keeps this event apart from other information with which it would usually be joined. Dissociation is a way for the mind to deal with the very hard things of life. Dissociation can be a symptom of an illness such as Post Traumatic Stress Disorder , Generalized Anxiety ,Disorder etc.
http://www.caritas.ab.ca/NR/rdonlyres/epkjity25zyck2ldozmsope6jq3qifw3fbj6ucyunemjzdf5gmzdbz3g4eycwbn27oelc5vbv2otrd/What%25252bis%25252bDissociation.pdfWikipedia gives information on crush fetishism by explaining " The main reason that crush fetishes form is that the child/adolescent who acquired it, experienced a situation in which they deemed shocking or had an impact on their life while experiencing puberty. The brain performs a mental substitution for the person forming the fetish and links it to sexual stimulation. Later on, when a similar experience is performed, the neurotransmitter phenylethylamine (chemical responsible for infatuation and love) is activated and provokes sexual arousal. Continued thoughts and exposure to such scenarios strengthens the connection increasing the likelihood of it becoming permanent."
http://en.wikipedia.org/wiki/Talk%3ACrush_fetishA crush fetishist presents his views " “It’s my oldest fetish with no known origin, and I like it for about the same reason as eproctophilia.
Maybe that I also disliked seeing people kill bugs as a kid, while also finding it arousing."
https://drmarkgriffiths.wordpress.com/tag/crush-fetishes/Please do take your time to analyze and read. Views and opinions are welcomed ...