Śrīmad-Bhāgavatam 3.6.19
మేఢ్రం తస్య వినిర్భిన్నం స్వధిష్ణ్యం క ఉపావిశత్ ।
రేతసాంశేన యేనాసావానన్దం ప్రతిపద్యతే ॥ ౧౯ ॥
meḍhraṁ tasya vinirbhinnaṁ
[medhram tasya vinirbhinnam]
sva-dhiṣṇyaṁ ka upāviśat
[sva-dhishnyam ka upaavishat]
retasāṁśena yenāsāv
[retasaamshena yenaasaav]
ānandaṁ pratipadyate
[aanandam pratipadyate]
Word-for-word
meḍhram
—
genitals
tasya
—
of the gigantic form
vinirbhinnam
—
being separated
sva-dhiṣṇyam
—
own position
kaḥ
—
Brahmā, the original living creature
upāviśat
—
entered
retasā aṁśena
—
with the part of the semen
yena
—
by which
asau
—
the living entity
ānandam
—
sex pleasure
pratipadyate
—
experiences.
Blended reading (Sanskrit + English inline)
meḍhraṁ tasya vinirbhinnaṁ
meḍhram
genitals
tasya
of the gigantic form
vinirbhinnam
being separated
sva-dhiṣṇyaṁ ka upāviśat
sva-dhiṣṇyam
own position
kaḥ
Brahmā, the original living creature
upāviśat
entered
retasāṁśena yenāsāv
retasā aṁśena
with the part of the semen
yena
by which
asau
the living entity
ānandaṁ pratipadyate
ānandam
sex pleasure
pratipadyate
experiences.
When the genitals of the gigantic form separately became manifest, then Prajāpati, the original living creature, entered into them with his partial semen, and thus the living entities can enjoy sex pleasure.
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
When the gross sex organ (adhibhūta) of the universal form became differentiated, the presiding deity Prajāpati along with its portion the subtle sense organ which emits semen entered and dwelled there. By this sense organ sexual bliss appeared.
Kaḥ means Prajāpati. [Note: This means Brahmā or any of his sons called Prajāpatis. But Brahmā is the presiding deity of intelligence according to verse 23. Thus, some take this deity to mean Dakṣa.] Retasā (by semen) means the sense organ which gives semen.
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Source: vedabase.io