As we've discussed in a general question regarding the requirements for metzitzah b'peh (MBP), the direct-oral-contact technique to draw blood from the penis of an 8-day old infant at his bris milah has become controversial as a serious health issue. My question is whether the sources who advocate metzitzah b'peh with direct oral contact for infants also require it when an adult Jewish male is seeking circumcision (as many Russian immigrants needed to), or in the case of adult male converts. Also, if the man was already circumcised and requires only hatafas dam bris (a ceremonial drawing of some blood), would metzitzah b'peh with direct oral contact be necessary?
I ask these questions because when I converted I did not have MBP, and I have not heard of any other converts having gone through that. However, I and most converts I know only had a hatafas dam bris. Moreover, in either case blood could be drawn out of an adult penis more easily, it would seem to me, through squeezing the tissue, whereas an infant's penis may simply be too small to do that without causing injury. That's just my speculation, however.