>>Are lips made for kissing?

ppl get bit during kisses.

>>Are hands made for masturbation?

ppl get injured during masturbation.

http://www.alternet.org/top-5-strangest-masturbation-related-injuries

>>Are breasts made for anything other than suckling children?

i hear nursing moms complain of bites and soreness and other issues.

http://www.lalecheleague.org/llleaderweb/lv/lvfebmar00p10.html

>None of these are potentially hazardous to said body part.

anal sex isn't any more potentially hazardous than vaginal sex.