potisje

Why don't you use read-only media (CDs, DVDs) for your master key (backup)?

Those are very hard to temper with, while USB sticks are trivial to temper with (be it accidentally or by someone with malicious intent).

You caught a typo of mine. I flipped the Others and Sex with child values for E (women). Corrected.

Why wouldn't it be the other way around? It seems plausible to me that those who aren't open about their paraphilias would also respond with a "Thanks but no thanks" when a research assistant calls them to inquire about his abnormal sexuality.

There are significant differences. See the table I just posted.

A merge of the most interesting tables (D = desire, E = experience, * = significant difference from the other group (men vs. women, internet vs. phone)):

                           D (overall) D (men) D (women) E (overall) E (men) E (women) E (internet) E (telephone)
  Voyeurism                46.3        60.0*   34.7      34.5        50.3*   21.2      38.3*        30.4
  Fetishism                44.5        40.4    47.9      26.3        30.1    23.2      31.5*        20.8
  Exhibitionism (extended) 30.6        35.0    26.9      30.9        32.6    29.4      37.0*        24.2
  Frotteurism              26.7        34.2*   20.7      26.1        32.4*   20.5      32.2*        19.2
  Masochism                23.8        19.2    27.8*     19.2        13.9    23.7*     23.9*        14.2
  Sadism                   7.1         9.5     5.1       5.5         7.4     3.9       6.3          4.6
  Transvestism             6.3         7.2     5.5       4.9         6.5     3.5       5.7          4.0
  Exhibitionism (strict)   4.5         5.9     3.4       5.0         7.8*    2.7       5.2          4.7
  Sex with child           0.6         1.1     0.2       0.4         0.6     0.2       0.7          0
  Others                   NA          NA      NA        3.6         4.8     2.5       5.9*         1.0

The article:

Joyal, C. C., & Carpentier, J. (2016). The Prevalence of Paraphilic Interests and Behaviors in the General Population: A Provincial Survey. The Journal of Sex Research, 0(0), 1–11. http://doi.org/10.1080/00224499.2016.1139034

Its abstract:

Paraphilic sexual interests are defined as unusual or anomalous, but their actual occurrence in nonclinical samples is still unknown. This study looked at desire for and experience of paraphilic behaviors in a sample of adult men and women in the general population. A secondary goal was to compare the results of two survey modes—traditional landline telephone versus online. A total of 1,040 persons classified according to age, gender, education, ethnic background, religious beliefs, area of residency, and corresponding to the norm for the province of Quebec were interviewed. Nearly half of this sample expressed interest in at least one paraphilic category, and approximately one-third had had experience with such a practice at least once. Voyeurism, fetishism, frotteurism, and masochism interested both male and female respondents at levels above what is usually considered to be statistically unusual (15.9%). Interestingly, levels of interest in fetishism and masochism were not significantly different for men and women. Masochism was significantly linked with higher satisfaction with one’s own sexual life. As expected, the online mode generated more acknowledgment of paraphilic interest than the telephone mode. These results call into question the current definition of normal (normophilic) versus anomalous (paraphilic) sexual behaviors.