cinse -cin- gismu

x1 in activity/state x2 exhibits sexuality/gender/sexual orientation x3 (ka) by standard x4.

Also: x1 courts/flirts; x3 could be a ka[gender or role], ka[attraction to a gender], or ka[type of activity], etc.; (adjective:) x1 is sexual/sexy; x1 is flirted with/courted by x2 (= cinfriti, cinjikca). Cf. gletu, pinji, plibu, vibna, vlagi.

In notes:

gletu
x1 copulates/mates/has coitus/sexual intercourse with x2.
pinji
x1 is a/the clitoris/penis [projecting reproductive organ; body-part] of x2.
plibu
x1 is a/the pubic area/external genitalia [body-part] of x2.
vibna
x1 is a/the vagina [body-part] of x2.
vlagi
x1 is a/the vulva [body-part] of x2.
ro'u
emotion category/modifier: sexual - sexual abstinence.
cincizra
n1=z1=x1 is sexually deviant/perverted in activity/state n2=x2 in property z3=n3=x3 to person/by reference point z2=n4=x4; x1 is sexually perverted
cinjikca
j1=c1 courts/flirts with j1, exhibiting sexuality/gender/sexual orientation c3 (ka) by standard c4.
cinmle
m1=c1 is sexy/hot/attractive to m2 in aspect m3 by standard m4=c4.
cinpampe'o
x1 is a [significant other/boyfriend/girlfriend] to x2
glepe'o
p1=g2 is a sexual partner of p2=g1.
lagbractebi
c1=v1 is labia majora/outer vaginal labia/ lips of body v2
pampe'o
pr1=pe1 is a lover of pr2=pe2.
sorcinpa'i
x1=c1=p1 is sexually polyamorous/sexually loves many people/more than one person including, but not limited to, set x2=p2 in situation/activity/state x3=c2, exhibiting sexuality/gender/sexual orientation (ka) x4=c3 by standard x5=c4.
tracinse
c1=t1 in activity/state c2 exhibits/performs/expresses gender c3=t2 (ka) by standard c4.
xabycinse
c1 exhibits demisexuality in situation c2 by standard c4.
firca
x1 flirts with x2 by doing x3