The only sexual dysfunction I have is....

I cant get enough! lol
Hugs and kisses
TL

Sorry K, but I case I just ain't as cerebral as I once was.  I find that as I get older, I am more concerned about my own function.  That is assuming, of course, that our conjunction is functioning for us both at the junction.  Besides, I suspect many gents here participate to avoid their lady's dysfunction.

When speaking of "disorders" one is generally referring to conduct or a disability/dysfunction that causes distress to the individual AND that departs from that individual's societal and/or cultural norms.  So a disorder is relative to a subject's background, community etc.  What may qualify as a sexual disorder in a conservative culture may be considered normal behavior in another.  For example, homosexuality was long perceived as a disorder and I believe even listed as one in the earlier editions of the DSM.  I think this has changed or will in the next edition (DSM V).  I heard something recently on NPR regarding how transgender and cross-dressers should be defined in the next manual as well.  So cultures can vary not only one from another, but also over time.
I'm not sure if this really answers your question but hope it helps.
'Later

I think that depending on the individual situation, any, all or none of the categories you describe can be considered a disorder.
For any variation of human sexual behavior beyond reproductive vaginal intercourse, "normal" is a relative standard that depends on the culture, social norms, individual preferences and legal regulations. Generally, normal sexual behavior is anything that is mutually satisfying to all partners over time. For some it may mean celibacy while for others it is taking turns blowing the dog. Most of us are in this lifestyle because we believe any consensual relationship is "normal" regardless of the larger social standards and stigmas associated with it. I believe the same applies to mutually satisfying lack of sex.
Or, to throw all cerebral relativist arguments aside, a short answer to your question would be the old cliche "to each his/her own."

society, cultural and religious beliefs often

define our perspective and understanding of sexuality. Most sexual education is so general, biased and inaccurat that most people do not ever
Really get to know the true facts,or even themselves, their likes, dislikes.
Sometimes when we do start to figure it out we have to deal with the psychological reaction we have based on what we have learned over time.  
There are so many ways to connect
Intimately and erotically it is natural for our sexual exploration to change over time. When our exploration takes us beyond what we know we tend to experience some fear that can further inhibit our journey.
It is the jumping off point...do the same and get what you have gotten or change your perspective and
Embrace a new experience.
I do acknowledge biological issues sometimes our bodies change due to illness or injury but the majority of the time
Its not that and we have the oppertunity to grow
Step out of your box lovers! Xoxoxo
Tantra anyone?