In a monotransitive clause there are only two arguments; let's call them Subject and Object for purposes of this discussion.  If the verb is in the REFLEXIVE Voice, this indicates that the Subject and Object are identical.  (Example: "Jack loves-REFLX" with meaning "Jack loves Jack(himself)".)  If the verb is in the RECIPROCAL voice, this indicates that two acts, events, or states, are happening at once; S is V-ing O at the same time as O is V-ing S.  (Example: "Jack and Jill love-RECIP" with meaning "Jack loves Jill and Jill loves Jack".).  (Of course this can be interpreted a little differently with different TMA; for instance "Jack and Jill love-RECIP-PERF" could be taken to mean "Jack has loved Jill, and Jill has loved Jack" without implying that there was ever a time when each loved the other simultaneously.)  No monotransitive clause can be simultaneously REFLEXIVE and RECIPROCAL.

 

In a ditransitive clause, there are three core arguments; I'm going to temporarily call them S for Subject, DO for Direct Object, and IO for Indirect Object.  There are thus three different kinds of REFLEXIVE, and three different kinds of RECIPROCAL. 

 

REFLEXIVE could mean S=DO, or S=IO, or DO=IO.

S=DO example:  "Winston turned himself in to O'Brien".

S=IO example:  "Winston wrote himself a note."

DO=IO example:  "O'Brien showed Winston to himself(Winston)"

 

RECIPROCAL could mean S reciprocates with DO, or S reciprocates with IO, or DO reciprocates with IO.

S & DO example:  "Winston and Julia turned each other in to O'Brien"

S & IO example:  "Winston and Julia gave rings to each other"

DO & IO example:  "O'Brien married Winston and Julia to each other."

 

It is possible for a ditransitive clause to have both REFLEXIVEness and RECIPROCALness.

For instance, 

S=DO reciprocating with IO; "Winston and Julia devoted themselves to each other."

DO=IO reciprocating with S; "Winston and O'Brien each showed the other to himself."

(S=IO reciprocating with DO, running out of time and can't think of an example fast enough."

 

Are there languages in which two or all three kinds of REFLEXIVE and/or two or three kinds of RECIPROCAL are expressed in the Voice of ditransitive verbs?  Are there any in which a ditransitive verb can be both REFLEXIVE and RECIPROCAL?

 

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Tom H.C. in MI  (seems to have a lot of questions about ditransitives)